The Quintessential Guide to Compare and Contrast Essay Topics College

The Quintessential Guide to Compare and Contrast Essay Topics College After choosing the perfect topic for you, there are a number of straightforward things to do to help you begin in writing your essay. There are lots of others persuasive compare and contrast essay topics regarding education if you are ready to write about doing it. Every student was assigned a compare and contrast essay at least one time in a lifetime. To begin with, in the same way as any other bit of academic writing, a comparative essay ought to have an objective. By browsing compare and contrast essay examples, an individual can observe that a standard assignment is made up of 3 sections that have an introduction, discussion of your primary concept, the particular issues to study. Though you'll have different conclusions in the conclusion of each paragraph throughout the text, you also must have a conclusion as a distinct role in the conclusion of your essay. Whether you are prepared to compose your compare and contrast essay or you're in the practice of inventing your very own catchy topic it would be useful to check out compare and contrast essay examples to have a very clear picture of what you need to write. The illustration of an outline is given below. To compose a high-quality paper, you've got to understand how to select your topic properly and utilize it to create a practical outline. Wonderful paper demands reliable sources. Every familiar paper has an identical structure. A Startling Fact about Compare and Contrast Essay Topics College Uncovered You only have to order a very good essay from experts with the greatest academic degrees in an assortment of fields. You are able to choose one based on your field of study and individual interests. Needless to say, writing is among the top learning programs in any critical school institution. To collect such info, a detailed main research is necessary. Compare and Contrast Essay Topics College Can Be Fun for Everyone For instance, you may assist the reader see a meaningful connection between both subjects. So now you are aware of how to pick the best compare and contrast topics and the various segments you require to address when writing. Our on-line essay editing service g ives an excellent value for the money since you can acquire the best grades without sweating over it. The Upside to Compare and Contrast Essay Topics College You see it is an unusual topic that might be quite hard to imagine or explain, but some students might just turn that topic into a masterpiece. Academically suitable compare contrast essay topics ought to be stimulating along with attention-grabbing. Teacher will certainly value an exceptional composition that has no mistakes. You have to research the selected topic and discover facts to contradict your first thesis. You may also choose 1 topic at the moment and begin practicing. You have to research your topic to select three claims. Following that, you can't locate a perfect topic. Details of Compare and Contrast Essay Topics College On-line assistance from expert writers will help you save you a plenty of time. Finding the perfect topic isn't the hardest job in the planet, all you need to do is to take a few factors under consideration. Some topics might have a connection to the law for instance, death penalty or abortion legalization. Picking the ideal topic demands time. Though you're just beginning to compose essays, you shouldn't struggle attempting to think of something to discuss. You don't need to write about something which has been changed in how you want. Introduction with the highly effective hook and thesis statement stays the same. The one thing you must remember about picking the topic is it has to interest you. The Basic Facts of Compare and Contrast Essay Topics College Then again, you could be made to compare things which do not have that much in common. Philosophical topics may be controversial since many things have more than 1 explanation for it, therefore it isn't easy to decide on the truth. You're given the freedom to not just pick compare and contrast topics by yourself, but you need the freedom to decide on the side of your support along with how to contrast it.

Test Essay Samples - Look For The Best Resources

Test Essay Samples - Look For The Best ResourcesOne of the best ways to help yourself learn more about essay topics is to take a look at some of the great California Tea Essay samples on the internet. The people who created these examples know how to write quality essays and are willing to share their thoughts about different topics in an easy-to-read format.Many students think that just because they have been assigned a topic that they cannot do anything else with it. They often try to rush through it without really thinking about what they are doing. This can be particularly frustrating for people who want to focus on doing a good job and writing a well-researched essay.Using the right strategy is essential to doing a good job and getting the most out of your essay. Students who try to do just a quick draft will often not be able to put their thoughts into words as effectively as those who choose to write their essays out thoroughly. Those who write out their thoughts in an essay f ormat tend to understand the basic structure and outline. However, some students still need help coming up with a great topic.There are many different places where you can find essay samples for topics. Some of the best sources are websites like CraftShare. There you can get free 'essay' samples for many different topics. The sample pages can help you see exactly what type of work you should be doing when writing your own essay and what kind of topic would be appropriate.There are also many websites online that offer things called free assessment forms that are free to use in order to help you get the most out of your essay. There are many different subjects that you can choose from. These sites often offer samples for topics such as psychology, sociology, biology, math, or English composition.You may want to consider taking the time to compare test essay samples that you get on different websites. These websites are available in different formats that can easily be used in order to help you get your homework done properly. This is important because sometimes students may be a little hesitant to try different formats because they feel that they won't do well with one topic or another.If you find that there are just too many choices when it comes to choosing the type of topic that you want to write about, you can always look for essay test samples that have already been done. You can take a look at these types of sample essays online and get an idea of how they are written. It is possible that you may even be able to find some strategies that you can use for your own work.No matter what type of essay you are working on, you can rest assured that there are many different test essay samples that you can turn to in order to get your essay to the next level. These free resources are easy to access and can really help make your life easier if you are having a hard time coming up with a good topic. Take the time to compare your essays with the test essay samples and you will soon see the improvements that you can make to your own work.

John Donnes Poetry Essays - John Donne, Donne, Wit,

John Donne's Poetry John Donnes Poetry Style The poetry of John Donne expresses his personal spiritual beliefs. There exists a struggle in his writing with the church and his search spirituality. Donne uses the physical joining of a man and a woman to represent joining with God. Many of his poems describe the process of two people becoming one and ends in an even stronger desire for two to join into one. Even though there may not be any sexual activity occurring with in the body of the poem. This mirrors the churches and also mirrors the divide Donne feels between himself and God. Donne is torn between two faiths and cannot decide which one is the true faith. Donne has to the belief that perhaps it is not the churches but a soul's own desires to find the true faith. Death is another subject that Donne brings up. Donne chooses to use things he understands as metaphors for his own enlightenment. He compares ecstasy of sex with that of the sprit. Donne doesnt necessarily use the pleasure of being with a woman to how he would feel if joined with God, but instead he uses as a way to God. If sex is an ecstasy and mortal act that it is so great then spiritual ecstasy may feel even greater. This metaphor is important because Donne can easily relate. Donne's outlook of death as only a moment is another example. Death to John Donne may actually be the point where the journey for spiritual enlightenment ends. Poetry Essays

Definition and Examples of Editors

Definition and Examples of Editors An editor is an individual who oversees the preparation of a text for newspapers, magazines, scholarly journals, and books. The term editor may also refer to an individual who assists an author in copyediting a text. Editor Chris King describes her work as invisible mending. An editor, she says, is  like a ghost, in that her handiwork should never be apparent (Ghosting and Co-Writing in  The Ultimate Writing Coach, 2010).   Examples and Observations A good editor understands what youre talking and writing about and doesnt meddle too much.(Irwin Shaw)The worst editor of an authors writings is himself.(William Hone)Every writer needs at least one editor; most of us need two.(Donald Murray) Kinds of EditorsThere are many kinds of editors, related but not the same: journal editors; series editors; those who work with newspapers, magazines, films, as well as with books. The two kinds that concern us in scholarly publishing are editors and copyeditors. Unfortunately, the first term is commonly used for both, the causeor rather the resultof a confusion in thinking. . . .To define and oversimplify . . . the editors mind sees the entire manuscript, grasps the thinking behind it, clear or not clear, is trained to judge its intellectual quality and relation to other work, can spot a chapter or a section or even a paragraph that has gone awry, and can tell the author where to fix it and sometimes how. But this kind of mind is often impatient with lesser matters, does not relish the painstaking, and often painful, work of detailed correction.(August Frugà ©, A Skeptic Among Scholars. University of California Press, 1993) A Sense of HierarchyEditors need a hierarchical sense of a manuscript, a book, or article. They need to see its structure, its totality, before they become involved in minutiae. A writer should be on the alert when an editor starts by fixing commas or suggesting little cuts when the real problem resides at the level of organization or strategy or point of view. Most problems in writing are structural, even on the scale of the page. . . .A sense of hierarchy is all the more necessary in editing because writers, too, want to concentrate on the little things. . . . To take your pencil to a manuscript is to endorse it, to say it just needs some fixes, when in fact it is just as likely to need rethinking altogether. I want to say and sometimes do say, Well, lets see if its ready to be marked up.(Richard Todd in Good Prose: The Art of Nonfiction by Tracy Kidder and Richard Todd (Random House, 2013) Roles of an EditorEditors in publishing houses can be perceived as basically performing three different roles, all of them simultaneously. First, they must find and select the books the house is to publish. Second, they edit . . .. And third, they perform the Janus-like function of representing the house to the author and the author to the house.(Alan D. Williams, What Is an Editor? Editors on Editing, ed. by Gerald Gross. Grove, 1993) An Editors LimitsA writers best work comes entirely from himself. The [editing] process is so simple. If you have a Mark Twain, dont try to make him into a Shakespeare or make a Shakespeare into a Mark Twain. Because in the end an editor can get only as much out of an author as the author has in him.(Maxwell Perkins, quoted by A. Scott Berg in Max Perkins: Editor of Genius. Riverhead, 1978) Heywood Broun on the Editorial MindThe editorial mind, so called, is afflicted with the King Cole complex. Types subject to this delusion are apt to believe that all they need do to get a thing is to call for it. You may remember that King Cole called for his bowl just as if there were no such thing as a Volstead amendment. What we want is humor, says an editor, and he expects the unfortunate author to trot around the corner and come back with a quart of quips.An editor would classify What we want is humor as a piece of cooperation on his part. It seems to him a perfect division of labor. After all, nothing remains for the author to do except to write.(Heywood Broun, Are Editors People? Pieces of Hate and Other Enthusiasms. Charles H. Doran, 1922)

No topic Essay Example | Topics and Well Written Essays - 1250 words - 3

No topic - Essay Example Other notable improvements were made in weapons of mass destruction that can destroy the whole world in a blink. The inventions in science and medicine were not left behind with many inventions ranging from the highly disputed technology of test tube babies to cloning dominating the field. This work will address the inventions made and how they impact on the daily lives of people to see whether they are drawing us closer to a simple living or complicating life more. Among the issues that have risen with the developments in technology are the ethical and moral issues in some methods that are in place. Others include the environmental concerns caused by the emissions made from the industries and radioactive isotopes. One of the hot debates that have risen is the controlling of the content that is exposed on the internet and the lack of age barrier that exposes people to some content that can negatively affect their upbringing. The se of the internet has come with uncountable benefits that include enhanced business and communication. However, with the same failing to address the concerns raised due to the content that is available online and that has facilitated moral decadence and erosion of the cultures that governed people’s living, it has become more of a worry than help. Among the issues that have been discussed include how the content that is made available can be stopped from reaching people of a certain age group that can be considered too young to be exposed to such experience. It is hardly possible to stop the young children from owning or using phones due to their increased ease of availability. This has made children dummies as they rarely take part in active participation in the society but they prefer being engrossed on their television screens or video games the whole day. This has highly affected the way they perceive things and their reasoning as they are used to living

Social analysis of urban experience and sustainable tourism Essay

Social analysis of urban experience and sustainable tourism - Essay Example Urbanization in itself is a complex subject and has experienced a lot of social, environmental, commercial and geographical changes in the process of its evolution. Rapidly increasing population and globalised trade policies enforced the states to strengthen their industrial power.Consequently it led to the concentration of country population towards the industrial hubs shaping in big cities with dense population resulting in over exploitation; a major cause, threatening global biodiversity. (Wilcove, Rothstein, Dubow and Losos 1998). The urbanization had often faced anti - urban expressions from contemporary social-theorists. Besides the luxurious life, urbanization erased the originality of the indigenous and traditional system leading to social malfunctioning. It is estimated that a quarter of the endangered vertebrates in the United States of America and half of the endangered mammals is attributed to overexploitation (Primack 2002). 2. Urbanization and Society The process of urb anization deserves credit for its role in initiating Meritocracy ( Kamolnick 2005). Michael Young defined the term as; the rise of the meritocracy favors intelligence, aptitude and merit above all (Young 1958). The increase in the industries, created a large number of job opportunities lowering unemployment. Along with that the concept of capitalism has played a key role in urbanization and development of sophisticated technology in the world. However, these good sides of the urbanization carry equally dangerous ill-effects in the society and environment which is harmful to social system and nature. There is an extreme necessity of the sustainable development, mostly giving emphasis on sustainable tourism. As Pattullo and Orely (2009) asserts, the number of tourist trips in the year 2007 was some 900 million. And by 2020, it is expected to reach 1.6 billion making tourism $8 trillion industry employing 1 of 10 world workers. Simultaneously, such a huge increase in the number of tourists has resulted in some adverse ill-effects in the urban life experience, such as: 1. Cities are filled with mismanaged crowd resulting in over population. 2. Uncontrolled noise and air pollution due to huge nu mber of vehicles in the cities challenging public health in cities. 3. Increase in unmanageable garbage resulting in a dirty city environment. 4. Increase in prostitution and drug dealing, so to fulfill the demand of the tourists. 5. Cultural and ethical values in city life have been endangered due to its frequent exposure to foreign population. 6. Increase in security problems in cites, due to unaccountability of tourists giving easy entry to the terrorists and other criminals. As a result of the above mentioned factors, the urban life has changed into a suffocated one. However, to maintain the economic conditions, people are forced to stay back; otherwise they would have been seeking for peaceful options to live their life. Let us take, India as an example: In 1986, the first known case of HIV was diagnosed. Later that year, sex workers began showing signs of this deadly disease. It is learned that these foreigners were the ones responsible for the first infections (aidsindia 2011 ). At the end of 2009, India had 2.39 million people living with HIV (Times 2010). 3. Urbanization and sustainable development We have already discussed the environmental issues which are serious concern for many countries as urbanization is rooted all over the world. The only need is to construct the urban areas into habitable and sustainable cities. For this, we need to identify the urban problems and its solutions to reform it and also find out the ways to prepare the cities for sustainable tourism. To achieve such aims, there are some key-points to follow: To teach the people about garbage management. To provide more attention to conservation of natural resources. Preferring Eco friendly industries and machines that function without disturbing ecosystem. 4. Role of institutions and

Network System for Secure Communication

Network System for Secure Communication Methodology: The main methodology involved behind this research project is to provide the importance of such technology from professionals and well referred articles. Some of the general interviews will be added to the project with details showing their interest towards the current technology and also the change they see in communicating with the new technology. It on the hands of the components of IP Security that contribute to this level of secure communication: The IP Security (IPSec) Driver is used to monitor, filter, and secures the traffic throughout the system. The (ISAKMP/Oakley) abbreviated as Internet Security Association Key Management Protocol performs key exchange and management functions that oversee security issues between hosts, and provide keys which can be used with security algorithms. The IP Security Policy and the Security Associations are derived from those policies that define the security environment where two hosts can communicate. The function of Security Association API is to provide the interface between the IPSec driver, the Policy Agent and the ISAKMP. The function of the management tools is to create policies, monitor IP Security statistics, and log IP Security events. The main methodologies which are under consideration for this project are Classical encryption technologies, IP sec Tunnel, IP sec VPN, Internet Key Exchange methods, Block Cipher Data Encryption, Advanced Encryption, Symmetric ciphers, Public private key functions, Digital signature etc, which have suggested me to design a better system. Implementation: The main reason behind selecting IPSec is that it so powerful that it provides security to IP layer, and also forms the basis for all the other TCP/IP protocols. This is generally composed of two protocols: Authentication Header (AH); Encapsulating Security Payload (ESP); IPSec Implementation Methods: IPSec is comprised of several implementations architectures which are defined in RFC 2401. The IPSec implementation also depends on various factors including the version of IP used (v4 versus v6), the basic requirements of the application and other factors. End Host Implementation: Implementing IPSec in all host devices provides the most flexibility and security. It enables â€Å"end-to-end† security between any two devices on the network. Router Implementation: Router implementation however is a much simpler task since we only make changes to a few routers instead of hundreds or thousands of clients. It only provides protection between pairs of routers that implement IPSec, but this may be sufficient for certain applications such as virtual private networks (VPNs). The idea will be implemented after proper testing of various available methodologies. The current strategy for implementation is as follows:. We use certain open source softwares which provide encryption and decryption methods and authentication. In the actual system, the user is asked to enter details of files to be sent and also some other details about the password and the public keys if included. The required software are used in a way which helps to run a smooth process and secure operation. CONTENTS Acknowledgement I owe many thanks to people who helped supported me in doing my dissertation. Firstly, I would like to express my immense gratitude to my respected professor Mr. Dr. XXX, YYYY University, London for his support and motivation that has helped me to come up with this project. He supported me when its needed and suggested me in understanding various methodologies in my project. He also took care of my project with attention to achieve my goal. I thank to my Institution and faculty members for giving me an opportunity to do my dissertation and also for library, computer lab facilities for doing my dissertation to achieve practical results which can resolve my project related issues. I also extend my Heart full thanks to my family friends. I owe my special thanks to my Dad and his colleagues who gave me suggestions on doing my Dissertation. Abstract In the present system the network helps a particular organization to share the data by using external devices. The external devices are used to carry the data. The existing system cannot provide security, which allows an unauthorized user to access the secret files. It also cannot share a single costly printer. Many interrupts may occur within the system. Though it is advantageous we have numerous disadvantageous, somebody writes a program and can make the costly printer to misprint the data. Similarly some unauthorized user may get access over the network and may perform any illegal functions like deleting some of the sensitive information Security is the term that comes into picture when some important or sensitive information must be protected from an unauthorized access. Hence there must be some way to protect the data from them and even if he hacks the information because he should not be able to understand whats the actual information in the file, which is the main intention of the project. The project is designed to protect the sensitive information while it is in transaction in the network. There are many chances that an unauthorized person can have an access over the network in some way and can access this sensitive information. My main topic focuses on IPSec (Internet Protocol Security) is an extension to the IP protocol specified by IETF which provides security to the IP and the upper-layer protocols and cryptography in a network sharing system. It was first developed for the new IPv6 standard and then â€Å"back ported† to IPv4. The IPSec architecture is described in the IPSec uses two different protocols AH (Authentication Header) and ESP (Encapsulating security payload) to ensure the authentication, integrity and confidentiality of the communication. It uses strong cryptography to provide both authentication and encryption services. Authentication ensures that packets are from the right sender and have not been altered in transit. Encryption prevents unauthorised reading of packet contents. [2] Cryptography is the technique used to secure the data while they are in transactions. Encryption and Decryption are two techniques used under cryptography technology. Data cryptography is the art of securing the resource that is shared among the applications. The main idea behind the design is to provide a secured communication between the networks showing network level performance practically by differentiating different operating system which can ensure the security, authenticity by considering, analyzing and testing any best available methodologies. 1. Introduction: Businesses today are focused on the importance of securing customer and business data. Increasing regulatory requirements are driving need for security of data. There have been many methods which have evolved over the years to address the need for security. Many of the methods are focused at the higher layers of the OSI protocol stack, thus compensating the IPs lack in resolving security issues. These solutions can be implemented in certain situations, but they cannot be generalized because they are particularly too many applications. For example, Secure Sockets Layer (SSL) can be used for certain applications like World Wide Web access or FTP, but there are many other applications which cannot be resolved with this type of security. A solution is required to allow security at the IP level was very necessary so that all higher-layer protocols in TCP/IP could take advantage of it. When the decision was made to develop a new version of IP (IPv6), this was the golden opportunity to resolve not just the addressing problems in the older IPv4, but also resolve lack of security issues as well. Later a new security technology was developed with IPv6 in mind, but since IPv6 has taken long time to develop, and thus a solution was designed to be usable for both IPv4 and IPv6. The technology which brings a secure communications to the Internet Protocol is known as IP Security, commonly abbreviated as IPSec. IPSec services allow users to build secure tunnels through certain networks. All the data that passes through the entrusted net is encrypted by the IPSEC gateway machine and decrypted by the gateway at the other end. The result obtained is a Virtual Private Network or VPN. This network is effectively private even though it includes machines at several different sites which are connected by the insecure Internet. Cryptography technique is used to secure the data while they are in transactions. Encryption and Decryption are two techniques which are used under cryptography technology. Data cryptography is the art of securing the resource that is shared among the applications. The Encryption and Decryption are termed as two powerful security technologies that are widely implemented to protect the data from loss and deliberate compromise. In this project the networking allows the company to share files or data without using certain external devices. Some unauthorized users may get access over the network and perform some illegal functions in certain cases like deleting files while the transaction is still on at that time encryption and then decryption techniques are implemented to secure the data. Many other attacks in cryptography are considered which lead me to research on different types of IPSec implementation methodologies in order to design the best model such that it may be suitable for the present trend of networking systems also form a platform to enable communication to the outside world. Thus in orders to implement IPSec, certain modifications are required to the systems communications routines and certain new systems processes conduct secret key negotiations. What is IPSec? An extension to the IP protocol is considered as IPSec which provides high level security to the IP and to the upper-layer protocols. This was initially developed for the new IPv6 standard and then was back ported to IPv4. IPSec provides the following security services: data origin authentication, connectionless integrity, replay protection, data confidentiality, limited traffic flow confidentiality, and key negotiation and management. It has been made mandatory by the IETF for the use of IPSec wherever feasible; the standards documents are close to completion, and there are numerous implementations. Overview of IPSec Architecture: The IPSec suite defined as a framework of open standards. The following protocols are used by IPSec to perform various functions. [2][3] IPSec provides three main facilities which are explained below: Internet key exchange(IKE and IKEv2) : This is used to set up a security association (SA) which can be done by handling negotiation of protocols and algorithms and generating the encryption and authentication keys which can be used by IPSec.[4][5] Authentication Header (AH): This is used to provide connectionless integrity and data origin authentication for IP datagrams and also provides protection against replay attacks.[6][7] Encapsulating Security Payload (ESP): This is used to provide confidentiality, data origin authentication, connectionless integrity, anti-replay service, and limited traffic flow confidentiality. [9] Both authentication and encryption are generally desired in this mechanism. Assure that unauthorized users do not penetrate the virtual private network Assure that eavesdroppers on the Internet cannot read messages sent over the virtual private network. Since both the above features are generally desirable, most implementations are likely to use ESP rather than AH. Security Association: The security Association mechanism is used for authentication (AH) and confidentiality (ESP) A one way relationship between a sender and a receiver that affords security services to the traffic carried on it. Security services are afforded to an SA for the use of AH or ESP but not both. SA identified by three parameters: Security Parameter Index (SPI) IP destination address Security protocol identifier Overview of IPSec Services and Functions: IPSec is not only assumed as a single protocol, but is rather considered as a set of services and protocols which provide a complete security solution to the IP network. These services and protocols are combined to provide various types of protection. Since IPSec usually works at the IP layer, it provides protection for any higher layer TCP/IP application or protocol without using any additional security methods, which is considered as a major strength for its implementation. General types of protection services offered by IPSec include: Encryption of user data to achieve privacy. Authentication and message integrity has to be achieved to ensure that it is not changed on route. Protection against certain types of security attacks, such as replay attacks. The ability of the devices to negotiate the security algorithms and keys required in order to meet their security needs. wo security modes called tunnel and transport are implemented to meet the various network needs. Features Benefits: IPSec is observed to be transparent by the end users. The users on the security mechanisms need not be trained. IPSec assures security measures for individuals. There is no requirement to change the software on a user or a server system. Strong security measures are applied to the entire traffic crossing the perimeter. 2. Objective: IPSec is mostly designed in order to encrypt the data between the two systems without any spoofing attacks. It is a key force of defence against internal and external attacks. However, other than these, there are many other security strategies which have prevented the security attacks. The main idea in my research is to provide a better approach to the implementation of IP Security by analyzing the present methodologies. In the implementation of this design, I am also considering different operating systems to provide a better approach towards security which can prove to be good in ideal ways. The design of such an approach is helpful in restricting any unauthorised access to the network and also helps in providing a secure and authenticated access. The main idea behind the design is to provide a secured communication between the networks independent of the operating system which can ensure the security, authenticity by considering, analyzing and testing any two best available methodologies. In my overview of RFCs available in the Internet such as Cryptography the receiver end of a particular communication channel is not aware of the sender unless the sender transmits some information with private and public keys with cipher text which can prove his authenticity. Now the receiver sends the same package with his signature and then the receiver is also authenticated mutually. Attacks may occur in different ways. There are also many ways where in such communications can be detected and using techniques like eavesdropping or sniffing or man in the middle attack. These are the three major problems for secure communications. In my research, I will attempt to design a procedure which can be easily followed in order to overcome such problems. There are many techniques available now which are better than normal communication. The major problem in such techniques is the implementation of man in the middle attack. There have been many advances to try and rectify the problems but there has always been a flaw in the design. My research is to design a system using the current technologies used to encrypt and authenticate. These techniques play a major role in the implementation of IP Security. The major interest would be in areas like encryption, decryption and authentication. Additions will be done to this research as it is implemented. The goal is to use research existing systems and to suggest a system which makes it even hard to break. It is not 100% immune to attacks but the attack may take longer to break the system than the present rate. This system will also be very safe and will be easy to use in daily life rather than something with a dozen processing steps to be followed. 2.2 SCOPE With the rapid development of Multimedia data management technologies over the internet there is need to concern about the internet there is need to concern about the security and privacy of information. In multimedia document, dissipation and sharing of data is becoming a common practice for internet based application and enterprises. As the internet forms the open source the present for all users security Forms the critical issue. Hence the transfer of information over the internet forms the critical issue. At the present situations the cryptographic techniques are used for providing ‘SECURITY. 2.3 PROJECT PERSPECTIVE The project â€Å"Network system for Secure Communication† is totally enhanced with the features that enable us to feel the real-time environment. Todays world is mostly employing the latest networking techniques instead of using stand-alone PCs. IPSec tunnelling or Encryption, information scrambling technology is an important security tool. By properly applying, it can provide a secure communication channel even when the underlying system and network infrastructure is not secure. This is particularly important when data passes through the shared systems or network segments where multiple people may have access to the information. In these situations, sensitive data and especially passwords should be encrypted in order to protect it from unintended disclosure or modification. 2.4 PROPOSED SYSTEM In this system ‘security is the term that comes into picture when some important or sensitive information must be protected from an unauthorized access. Hence there must be some way to protect the data from them and even if he hacks the information, The proposed system provides the ‘security and it does not allow unauthorized users to access the secret files. As per the ISO standards the security parameters are: Confidentiality Authentication Integrity Key distribution Access control CONFIDENTIALITY: Confidentiality is the protection of transmitted data from passive attacks. It can protect the data from unauthorized disclosure. AUTHENTICATION: A process used to verify the integrity of the transmitted data, especially a message. It is the process of proving ones identity to someone else. INTEGRITY: The sender and the receiver want to ensure that the content of their communication is not altered during transmission. KEY DISTRIBUTION: Key distribution can be defined as a term that refers to means of delivering a key to the communicating parties, without allowing others to see the key. ACCESS CONTROL: It is a ability to limit and control the access to host systems and applications via communication links. 3.Literature Review This project emphasis design and evaluates a computer-based system using appropriate process and tools. Most of the industry wide routers in the network implement their functionality in hardware and therefore we believe that hardware based routers are more efficient than a software-based router implementation besides that most of the work is in the research community which will be performed, using software-based routers utilizing off-the-shelf PCs. Various works have to be attempted which evaluates different protocol stack, however none of them use hardware-based routers, has such a wide range of metrics, and none investigated mechanisms. My research methodology emphasis surveys, forums from the internet and articles from IEEE (Institute of Electrical and Electronics EngineersorIEEE) a quantitative approach in advance technology. I also consider various other thesis and books which are best suitable for my project. Here following are the network related definitions, and few protocols from application layer, network and internet layer also discussed which actually gives clear idea of understanding the concepts. 3.1 IPSec Standards: IPSec is actually a collection of techniques and protocols; it is not defined in a single Internet standard. Instead, a collection of RFCs defines the architecture, services and specific protocols used in IPSec. Some of the most important of these are shown below: [RFC 2401] Security Architecture for the Internet Protocol (IPSec overview) The main IPSec document describes the architecture and general operation of the technology, and showing how the different components fit together. [RFC 2402] IP Authentication Header It defines the IPSec Authentication Header (AH) protocol used for ensuring data integrity and origin verification. [RFC 2403] The Use of HMAC-MD5-96 within ESP and AH Describes a particular encryption algorithm for use by AH and ESP called Message Digest 5 (MD5), HMAC variant. [RFC 2404] The Use of HMAC-SHA-1-96 within ESP and AH Describes a particular encryption algorithm for use by AH and ESP called Secure Hash Algorithm 1 (SHA-1), HMAC variant. [RFC 2406] IP Encapsulating and Security payload (ESP) It describes the IPSec Encapsulation Security Payload (ESP) protocol that provides data encryption for confidentiality. [RFC 2408] Internet Security Association and Key Management Protocol (ISAKMP) It defines methods for exchanging keys and negotiating security associations. [RFC 2409] The Internet Key Exchange (IKE) Describes the Internet Key Exchange (IKE) protocol used to negotiate security associations and exchange keys between devices for secure communications. It is based on ISAKMP and OAKLEY. [RFC 2412] The OAKLEY Key Determination Protocol It describes a generic protocol for key exchange. [RFC 2131] Dynamic Host Configuration Protocol (DHCP) DHCP allows a host to obtain an IP address automatically, as well as to learn additional information about subnet mask, the address of its first-hop router, and the address of its local DNS server. [RFC 2131; RFC 3022] Network Address Translation (NAT)- In an attempt to provide transparent routing to hosts, NAT devices are used to connect an isolated address realm with private unregistered addresses to an external realm with globally unique registered addresses. Domain Name System (DNS): It is a hierarchical naming system for computers, services, or any resource connected to the Internet or a private network. It associates various other information with domain names assigned to each of the participants. Most importantly, it translates domain names meaningful to humans into the numerical (binary) identifiers associated with networking equipment for the purpose of locating and addressing these devices worldwide. For example, www.example.com translates to 208.77.188.166. Windows Internet Name Service (WINS): It is Microsofts implementation of NetBIOS Name Service (NBNS), a name server and service for NetBIOS computer names. Effectively WINS is to NetBIOS names, like DNS is to domain names in fact its a central mapping of host names to network addresses. Like DNS it is broken into two parts, a Server Service (that manages the encoded Jet Database, server to server replication, service requests, and conflicts) and a TCP/IP Client component which manages the clients registration and renewal of names, and takes care of queries. VPN (Virtual Private Network) : It is a virtual computer network that exists over the top of an existing network. The purpose of a VPN is to allow communications between systems connected to the VPN using an existing shared network infrastructure as the transport, without the VPN network being aware of the existence of the underlying network backbone or without the VPN interfering with other network traffic on the backbone. A VPN between two networks is often referred to as a VPN Tunnel. Most VPN technologies can be separated into two broad categories, Secure VPNs and Trusted VPNs. Internet Protocol version 6 (IPv6): It is the next-generation Internet Protocol version designated as the successor to IPv4. It is an Internet Layer protocol for packet-switched internetworks. The main driving force for the redesign of Internet Protocol was the foreseeable IPv4 address exhaustion. IPv6 was defined in December 1998 by the Internet Engineering Task Force (IETF) with the publication of an Internet standard specification, RFC 2460. IPv6 has a vastly larger address space than IPv4. This results from the use of a 128-bit address, whereas IPv4 uses only 32 bits. This expansion provides flexibility in allocating addresses and routing traffic and eliminates the primary need for network address translation (NAT), which gained widespread deployment as an effort to alleviate IPv4 address exhaustion. Due to its security and flexibility entire Internet will be deployed byIPv6 in 2012 as expected. Tunnelling: In computer networks tunnelling protocol (delivery protocol) encapsulates the different payload protocol i.e., It carries a payload over an incompatible delivery-network. It can also provide a secure path through an untrusted network without any data loss. Transport Layer Security (TLS): Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide security for communications over networks such as the Internet. TLS and SSL encrypt the segments of network connections at the Transport Layer end-to-end. Encryption: In cryptography, encryption is the process of transforming information (referred to as plaintext) using an algorithm (called cipher) to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key. The result of the process is encrypted information (in cryptography, referred to as cipher text). In many contexts, the word encryption also implicitly refers to the reverse process, decryption. Internet Key Exchange: Internet Key Exchange (IKE or IKEv2) is the protocol used to set up a security association (SA) in the IPSec protocol suite. IKE uses a Diffie-Hellman key exchange to set up a shared session secret, from which cryptographic keys are derived. Public key techniques or, alternatively, a pre-shared key, are used to mutually authenticate the communicating parties. 4.IPSec System Architecture Authentication Header and Encapsulating Security Payload are commonly called â€Å"protocols†, though this is another case where the validity of this term is debatable. They are not really distinct protocols but are implemented as headers that are inserted into IP datagrams, as we will see. They thus do the â€Å"grunt work† of IPSec, and can be used together to provide both authentication and privacy. IPSec protocols: The IPSec protocol family consists of two protocols: Authentication Header (AH) and Encapsulated Security Payload (ESP). Both these protocols are independent IP. AH is the IP protocol 51 and ESP is the IP protocol 50 Authentication Header: This is a member of the IPSec protocol suite. Authentication Header provides connectionless data integrity and data origin authentication of IP packets. Further, it can also provide protection against the replay attacks by using the sliding window technique and by discarding the old packets. Authentication Header also gives protection for the IP payload and all the header fields of an IP datagram. AH generally operates on the stop of IP, by using the IP protocol number 51. An AH packet diagram is shown below which describes how an AH packet can be constructed and interpreted: Field meanings: Next header: This field is an 8-bit field that mainly identifies the type of the next payload obtained after the Authentication Header. The value of this field can be chosen from the set of defined IP Protocol Numbers. RESERVED These fields are usually reserved for the future use. Payload length This defines the size of Authentication Header packet. Sequence number This field represents a monotonically increasing number which is used to prevent certain replay attacks. Security parameters index (SPI) This field is used to identify the security parameters, in combination with the IP address, and then identify the security association techniques implemented with this packet. Authentication data This field contains the integrity check value (ICV) which is necessary to authenticate the packet. This field may also contain padding. Encapsulating Security Payload: ESP which can be expanded as Encapsulating Security Payload is a member belonging of the IPSec protocol suite. IPSec achieves integrity, origin authenticity, and confidentiality protection of packets. This protocol also supports encryption-only and authentication-only configurations. However usage of only encryption technique without authentication is not recommended because it is termed insecure. ESP does not protect the IP packet header like the Authentication Header (AH) does. The packet diagram below shows how an ESP packet is constructed and interpreted: Field meanings: Security paramete Network System for Secure Communication Network System for Secure Communication Methodology: The main methodology involved behind this research project is to provide the importance of such technology from professionals and well referred articles. Some of the general interviews will be added to the project with details showing their interest towards the current technology and also the change they see in communicating with the new technology. It on the hands of the components of IP Security that contribute to this level of secure communication: The IP Security (IPSec) Driver is used to monitor, filter, and secures the traffic throughout the system. The (ISAKMP/Oakley) abbreviated as Internet Security Association Key Management Protocol performs key exchange and management functions that oversee security issues between hosts, and provide keys which can be used with security algorithms. The IP Security Policy and the Security Associations are derived from those policies that define the security environment where two hosts can communicate. The function of Security Association API is to provide the interface between the IPSec driver, the Policy Agent and the ISAKMP. The function of the management tools is to create policies, monitor IP Security statistics, and log IP Security events. The main methodologies which are under consideration for this project are Classical encryption technologies, IP sec Tunnel, IP sec VPN, Internet Key Exchange methods, Block Cipher Data Encryption, Advanced Encryption, Symmetric ciphers, Public private key functions, Digital signature etc, which have suggested me to design a better system. Implementation: The main reason behind selecting IPSec is that it so powerful that it provides security to IP layer, and also forms the basis for all the other TCP/IP protocols. This is generally composed of two protocols: Authentication Header (AH); Encapsulating Security Payload (ESP); IPSec Implementation Methods: IPSec is comprised of several implementations architectures which are defined in RFC 2401. The IPSec implementation also depends on various factors including the version of IP used (v4 versus v6), the basic requirements of the application and other factors. End Host Implementation: Implementing IPSec in all host devices provides the most flexibility and security. It enables â€Å"end-to-end† security between any two devices on the network. Router Implementation: Router implementation however is a much simpler task since we only make changes to a few routers instead of hundreds or thousands of clients. It only provides protection between pairs of routers that implement IPSec, but this may be sufficient for certain applications such as virtual private networks (VPNs). The idea will be implemented after proper testing of various available methodologies. The current strategy for implementation is as follows:. We use certain open source softwares which provide encryption and decryption methods and authentication. In the actual system, the user is asked to enter details of files to be sent and also some other details about the password and the public keys if included. The required software are used in a way which helps to run a smooth process and secure operation. CONTENTS Acknowledgement I owe many thanks to people who helped supported me in doing my dissertation. Firstly, I would like to express my immense gratitude to my respected professor Mr. Dr. XXX, YYYY University, London for his support and motivation that has helped me to come up with this project. He supported me when its needed and suggested me in understanding various methodologies in my project. He also took care of my project with attention to achieve my goal. I thank to my Institution and faculty members for giving me an opportunity to do my dissertation and also for library, computer lab facilities for doing my dissertation to achieve practical results which can resolve my project related issues. I also extend my Heart full thanks to my family friends. I owe my special thanks to my Dad and his colleagues who gave me suggestions on doing my Dissertation. Abstract In the present system the network helps a particular organization to share the data by using external devices. The external devices are used to carry the data. The existing system cannot provide security, which allows an unauthorized user to access the secret files. It also cannot share a single costly printer. Many interrupts may occur within the system. Though it is advantageous we have numerous disadvantageous, somebody writes a program and can make the costly printer to misprint the data. Similarly some unauthorized user may get access over the network and may perform any illegal functions like deleting some of the sensitive information Security is the term that comes into picture when some important or sensitive information must be protected from an unauthorized access. Hence there must be some way to protect the data from them and even if he hacks the information because he should not be able to understand whats the actual information in the file, which is the main intention of the project. The project is designed to protect the sensitive information while it is in transaction in the network. There are many chances that an unauthorized person can have an access over the network in some way and can access this sensitive information. My main topic focuses on IPSec (Internet Protocol Security) is an extension to the IP protocol specified by IETF which provides security to the IP and the upper-layer protocols and cryptography in a network sharing system. It was first developed for the new IPv6 standard and then â€Å"back ported† to IPv4. The IPSec architecture is described in the IPSec uses two different protocols AH (Authentication Header) and ESP (Encapsulating security payload) to ensure the authentication, integrity and confidentiality of the communication. It uses strong cryptography to provide both authentication and encryption services. Authentication ensures that packets are from the right sender and have not been altered in transit. Encryption prevents unauthorised reading of packet contents. [2] Cryptography is the technique used to secure the data while they are in transactions. Encryption and Decryption are two techniques used under cryptography technology. Data cryptography is the art of securing the resource that is shared among the applications. The main idea behind the design is to provide a secured communication between the networks showing network level performance practically by differentiating different operating system which can ensure the security, authenticity by considering, analyzing and testing any best available methodologies. 1. Introduction: Businesses today are focused on the importance of securing customer and business data. Increasing regulatory requirements are driving need for security of data. There have been many methods which have evolved over the years to address the need for security. Many of the methods are focused at the higher layers of the OSI protocol stack, thus compensating the IPs lack in resolving security issues. These solutions can be implemented in certain situations, but they cannot be generalized because they are particularly too many applications. For example, Secure Sockets Layer (SSL) can be used for certain applications like World Wide Web access or FTP, but there are many other applications which cannot be resolved with this type of security. A solution is required to allow security at the IP level was very necessary so that all higher-layer protocols in TCP/IP could take advantage of it. When the decision was made to develop a new version of IP (IPv6), this was the golden opportunity to resolve not just the addressing problems in the older IPv4, but also resolve lack of security issues as well. Later a new security technology was developed with IPv6 in mind, but since IPv6 has taken long time to develop, and thus a solution was designed to be usable for both IPv4 and IPv6. The technology which brings a secure communications to the Internet Protocol is known as IP Security, commonly abbreviated as IPSec. IPSec services allow users to build secure tunnels through certain networks. All the data that passes through the entrusted net is encrypted by the IPSEC gateway machine and decrypted by the gateway at the other end. The result obtained is a Virtual Private Network or VPN. This network is effectively private even though it includes machines at several different sites which are connected by the insecure Internet. Cryptography technique is used to secure the data while they are in transactions. Encryption and Decryption are two techniques which are used under cryptography technology. Data cryptography is the art of securing the resource that is shared among the applications. The Encryption and Decryption are termed as two powerful security technologies that are widely implemented to protect the data from loss and deliberate compromise. In this project the networking allows the company to share files or data without using certain external devices. Some unauthorized users may get access over the network and perform some illegal functions in certain cases like deleting files while the transaction is still on at that time encryption and then decryption techniques are implemented to secure the data. Many other attacks in cryptography are considered which lead me to research on different types of IPSec implementation methodologies in order to design the best model such that it may be suitable for the present trend of networking systems also form a platform to enable communication to the outside world. Thus in orders to implement IPSec, certain modifications are required to the systems communications routines and certain new systems processes conduct secret key negotiations. What is IPSec? An extension to the IP protocol is considered as IPSec which provides high level security to the IP and to the upper-layer protocols. This was initially developed for the new IPv6 standard and then was back ported to IPv4. IPSec provides the following security services: data origin authentication, connectionless integrity, replay protection, data confidentiality, limited traffic flow confidentiality, and key negotiation and management. It has been made mandatory by the IETF for the use of IPSec wherever feasible; the standards documents are close to completion, and there are numerous implementations. Overview of IPSec Architecture: The IPSec suite defined as a framework of open standards. The following protocols are used by IPSec to perform various functions. [2][3] IPSec provides three main facilities which are explained below: Internet key exchange(IKE and IKEv2) : This is used to set up a security association (SA) which can be done by handling negotiation of protocols and algorithms and generating the encryption and authentication keys which can be used by IPSec.[4][5] Authentication Header (AH): This is used to provide connectionless integrity and data origin authentication for IP datagrams and also provides protection against replay attacks.[6][7] Encapsulating Security Payload (ESP): This is used to provide confidentiality, data origin authentication, connectionless integrity, anti-replay service, and limited traffic flow confidentiality. [9] Both authentication and encryption are generally desired in this mechanism. Assure that unauthorized users do not penetrate the virtual private network Assure that eavesdroppers on the Internet cannot read messages sent over the virtual private network. Since both the above features are generally desirable, most implementations are likely to use ESP rather than AH. Security Association: The security Association mechanism is used for authentication (AH) and confidentiality (ESP) A one way relationship between a sender and a receiver that affords security services to the traffic carried on it. Security services are afforded to an SA for the use of AH or ESP but not both. SA identified by three parameters: Security Parameter Index (SPI) IP destination address Security protocol identifier Overview of IPSec Services and Functions: IPSec is not only assumed as a single protocol, but is rather considered as a set of services and protocols which provide a complete security solution to the IP network. These services and protocols are combined to provide various types of protection. Since IPSec usually works at the IP layer, it provides protection for any higher layer TCP/IP application or protocol without using any additional security methods, which is considered as a major strength for its implementation. General types of protection services offered by IPSec include: Encryption of user data to achieve privacy. Authentication and message integrity has to be achieved to ensure that it is not changed on route. Protection against certain types of security attacks, such as replay attacks. The ability of the devices to negotiate the security algorithms and keys required in order to meet their security needs. wo security modes called tunnel and transport are implemented to meet the various network needs. Features Benefits: IPSec is observed to be transparent by the end users. The users on the security mechanisms need not be trained. IPSec assures security measures for individuals. There is no requirement to change the software on a user or a server system. Strong security measures are applied to the entire traffic crossing the perimeter. 2. Objective: IPSec is mostly designed in order to encrypt the data between the two systems without any spoofing attacks. It is a key force of defence against internal and external attacks. However, other than these, there are many other security strategies which have prevented the security attacks. The main idea in my research is to provide a better approach to the implementation of IP Security by analyzing the present methodologies. In the implementation of this design, I am also considering different operating systems to provide a better approach towards security which can prove to be good in ideal ways. The design of such an approach is helpful in restricting any unauthorised access to the network and also helps in providing a secure and authenticated access. The main idea behind the design is to provide a secured communication between the networks independent of the operating system which can ensure the security, authenticity by considering, analyzing and testing any two best available methodologies. In my overview of RFCs available in the Internet such as Cryptography the receiver end of a particular communication channel is not aware of the sender unless the sender transmits some information with private and public keys with cipher text which can prove his authenticity. Now the receiver sends the same package with his signature and then the receiver is also authenticated mutually. Attacks may occur in different ways. There are also many ways where in such communications can be detected and using techniques like eavesdropping or sniffing or man in the middle attack. These are the three major problems for secure communications. In my research, I will attempt to design a procedure which can be easily followed in order to overcome such problems. There are many techniques available now which are better than normal communication. The major problem in such techniques is the implementation of man in the middle attack. There have been many advances to try and rectify the problems but there has always been a flaw in the design. My research is to design a system using the current technologies used to encrypt and authenticate. These techniques play a major role in the implementation of IP Security. The major interest would be in areas like encryption, decryption and authentication. Additions will be done to this research as it is implemented. The goal is to use research existing systems and to suggest a system which makes it even hard to break. It is not 100% immune to attacks but the attack may take longer to break the system than the present rate. This system will also be very safe and will be easy to use in daily life rather than something with a dozen processing steps to be followed. 2.2 SCOPE With the rapid development of Multimedia data management technologies over the internet there is need to concern about the internet there is need to concern about the security and privacy of information. In multimedia document, dissipation and sharing of data is becoming a common practice for internet based application and enterprises. As the internet forms the open source the present for all users security Forms the critical issue. Hence the transfer of information over the internet forms the critical issue. At the present situations the cryptographic techniques are used for providing ‘SECURITY. 2.3 PROJECT PERSPECTIVE The project â€Å"Network system for Secure Communication† is totally enhanced with the features that enable us to feel the real-time environment. Todays world is mostly employing the latest networking techniques instead of using stand-alone PCs. IPSec tunnelling or Encryption, information scrambling technology is an important security tool. By properly applying, it can provide a secure communication channel even when the underlying system and network infrastructure is not secure. This is particularly important when data passes through the shared systems or network segments where multiple people may have access to the information. In these situations, sensitive data and especially passwords should be encrypted in order to protect it from unintended disclosure or modification. 2.4 PROPOSED SYSTEM In this system ‘security is the term that comes into picture when some important or sensitive information must be protected from an unauthorized access. Hence there must be some way to protect the data from them and even if he hacks the information, The proposed system provides the ‘security and it does not allow unauthorized users to access the secret files. As per the ISO standards the security parameters are: Confidentiality Authentication Integrity Key distribution Access control CONFIDENTIALITY: Confidentiality is the protection of transmitted data from passive attacks. It can protect the data from unauthorized disclosure. AUTHENTICATION: A process used to verify the integrity of the transmitted data, especially a message. It is the process of proving ones identity to someone else. INTEGRITY: The sender and the receiver want to ensure that the content of their communication is not altered during transmission. KEY DISTRIBUTION: Key distribution can be defined as a term that refers to means of delivering a key to the communicating parties, without allowing others to see the key. ACCESS CONTROL: It is a ability to limit and control the access to host systems and applications via communication links. 3.Literature Review This project emphasis design and evaluates a computer-based system using appropriate process and tools. Most of the industry wide routers in the network implement their functionality in hardware and therefore we believe that hardware based routers are more efficient than a software-based router implementation besides that most of the work is in the research community which will be performed, using software-based routers utilizing off-the-shelf PCs. Various works have to be attempted which evaluates different protocol stack, however none of them use hardware-based routers, has such a wide range of metrics, and none investigated mechanisms. My research methodology emphasis surveys, forums from the internet and articles from IEEE (Institute of Electrical and Electronics EngineersorIEEE) a quantitative approach in advance technology. I also consider various other thesis and books which are best suitable for my project. Here following are the network related definitions, and few protocols from application layer, network and internet layer also discussed which actually gives clear idea of understanding the concepts. 3.1 IPSec Standards: IPSec is actually a collection of techniques and protocols; it is not defined in a single Internet standard. Instead, a collection of RFCs defines the architecture, services and specific protocols used in IPSec. Some of the most important of these are shown below: [RFC 2401] Security Architecture for the Internet Protocol (IPSec overview) The main IPSec document describes the architecture and general operation of the technology, and showing how the different components fit together. [RFC 2402] IP Authentication Header It defines the IPSec Authentication Header (AH) protocol used for ensuring data integrity and origin verification. [RFC 2403] The Use of HMAC-MD5-96 within ESP and AH Describes a particular encryption algorithm for use by AH and ESP called Message Digest 5 (MD5), HMAC variant. [RFC 2404] The Use of HMAC-SHA-1-96 within ESP and AH Describes a particular encryption algorithm for use by AH and ESP called Secure Hash Algorithm 1 (SHA-1), HMAC variant. [RFC 2406] IP Encapsulating and Security payload (ESP) It describes the IPSec Encapsulation Security Payload (ESP) protocol that provides data encryption for confidentiality. [RFC 2408] Internet Security Association and Key Management Protocol (ISAKMP) It defines methods for exchanging keys and negotiating security associations. [RFC 2409] The Internet Key Exchange (IKE) Describes the Internet Key Exchange (IKE) protocol used to negotiate security associations and exchange keys between devices for secure communications. It is based on ISAKMP and OAKLEY. [RFC 2412] The OAKLEY Key Determination Protocol It describes a generic protocol for key exchange. [RFC 2131] Dynamic Host Configuration Protocol (DHCP) DHCP allows a host to obtain an IP address automatically, as well as to learn additional information about subnet mask, the address of its first-hop router, and the address of its local DNS server. [RFC 2131; RFC 3022] Network Address Translation (NAT)- In an attempt to provide transparent routing to hosts, NAT devices are used to connect an isolated address realm with private unregistered addresses to an external realm with globally unique registered addresses. Domain Name System (DNS): It is a hierarchical naming system for computers, services, or any resource connected to the Internet or a private network. It associates various other information with domain names assigned to each of the participants. Most importantly, it translates domain names meaningful to humans into the numerical (binary) identifiers associated with networking equipment for the purpose of locating and addressing these devices worldwide. For example, www.example.com translates to 208.77.188.166. Windows Internet Name Service (WINS): It is Microsofts implementation of NetBIOS Name Service (NBNS), a name server and service for NetBIOS computer names. Effectively WINS is to NetBIOS names, like DNS is to domain names in fact its a central mapping of host names to network addresses. Like DNS it is broken into two parts, a Server Service (that manages the encoded Jet Database, server to server replication, service requests, and conflicts) and a TCP/IP Client component which manages the clients registration and renewal of names, and takes care of queries. VPN (Virtual Private Network) : It is a virtual computer network that exists over the top of an existing network. The purpose of a VPN is to allow communications between systems connected to the VPN using an existing shared network infrastructure as the transport, without the VPN network being aware of the existence of the underlying network backbone or without the VPN interfering with other network traffic on the backbone. A VPN between two networks is often referred to as a VPN Tunnel. Most VPN technologies can be separated into two broad categories, Secure VPNs and Trusted VPNs. Internet Protocol version 6 (IPv6): It is the next-generation Internet Protocol version designated as the successor to IPv4. It is an Internet Layer protocol for packet-switched internetworks. The main driving force for the redesign of Internet Protocol was the foreseeable IPv4 address exhaustion. IPv6 was defined in December 1998 by the Internet Engineering Task Force (IETF) with the publication of an Internet standard specification, RFC 2460. IPv6 has a vastly larger address space than IPv4. This results from the use of a 128-bit address, whereas IPv4 uses only 32 bits. This expansion provides flexibility in allocating addresses and routing traffic and eliminates the primary need for network address translation (NAT), which gained widespread deployment as an effort to alleviate IPv4 address exhaustion. Due to its security and flexibility entire Internet will be deployed byIPv6 in 2012 as expected. Tunnelling: In computer networks tunnelling protocol (delivery protocol) encapsulates the different payload protocol i.e., It carries a payload over an incompatible delivery-network. It can also provide a secure path through an untrusted network without any data loss. Transport Layer Security (TLS): Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide security for communications over networks such as the Internet. TLS and SSL encrypt the segments of network connections at the Transport Layer end-to-end. Encryption: In cryptography, encryption is the process of transforming information (referred to as plaintext) using an algorithm (called cipher) to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key. The result of the process is encrypted information (in cryptography, referred to as cipher text). In many contexts, the word encryption also implicitly refers to the reverse process, decryption. Internet Key Exchange: Internet Key Exchange (IKE or IKEv2) is the protocol used to set up a security association (SA) in the IPSec protocol suite. IKE uses a Diffie-Hellman key exchange to set up a shared session secret, from which cryptographic keys are derived. Public key techniques or, alternatively, a pre-shared key, are used to mutually authenticate the communicating parties. 4.IPSec System Architecture Authentication Header and Encapsulating Security Payload are commonly called â€Å"protocols†, though this is another case where the validity of this term is debatable. They are not really distinct protocols but are implemented as headers that are inserted into IP datagrams, as we will see. They thus do the â€Å"grunt work† of IPSec, and can be used together to provide both authentication and privacy. IPSec protocols: The IPSec protocol family consists of two protocols: Authentication Header (AH) and Encapsulated Security Payload (ESP). Both these protocols are independent IP. AH is the IP protocol 51 and ESP is the IP protocol 50 Authentication Header: This is a member of the IPSec protocol suite. Authentication Header provides connectionless data integrity and data origin authentication of IP packets. Further, it can also provide protection against the replay attacks by using the sliding window technique and by discarding the old packets. Authentication Header also gives protection for the IP payload and all the header fields of an IP datagram. AH generally operates on the stop of IP, by using the IP protocol number 51. An AH packet diagram is shown below which describes how an AH packet can be constructed and interpreted: Field meanings: Next header: This field is an 8-bit field that mainly identifies the type of the next payload obtained after the Authentication Header. The value of this field can be chosen from the set of defined IP Protocol Numbers. RESERVED These fields are usually reserved for the future use. Payload length This defines the size of Authentication Header packet. Sequence number This field represents a monotonically increasing number which is used to prevent certain replay attacks. Security parameters index (SPI) This field is used to identify the security parameters, in combination with the IP address, and then identify the security association techniques implemented with this packet. Authentication data This field contains the integrity check value (ICV) which is necessary to authenticate the packet. This field may also contain padding. Encapsulating Security Payload: ESP which can be expanded as Encapsulating Security Payload is a member belonging of the IPSec protocol suite. IPSec achieves integrity, origin authenticity, and confidentiality protection of packets. This protocol also supports encryption-only and authentication-only configurations. However usage of only encryption technique without authentication is not recommended because it is termed insecure. ESP does not protect the IP packet header like the Authentication Header (AH) does. The packet diagram below shows how an ESP packet is constructed and interpreted: Field meanings: Security paramete