Internet Key Exchange

Kang Balitanas (2009) define IKE as a spontaneous key management protocol created by the combination of several other different key management protocols, and serves as the default key generator for IPsec, a shortened form for Internet Protocol Security. It creates, encrypts and authenticates all secret keys generated between two computers on a network.Advertising We will write a custom assessment sample on Internet Key Exchange specifically for you for only $16.05 $11/page Learn More It further helps to determine and configure security associations (SAs) necessary for a secure communication, and specifies the protocol format, cryptographic and hashing algorithms, used between the two computers. Kyburz (2010) notes that â€Å"the two peers on either side of the SA usually store the cryptographic keys, encryption algorithms, authentication schemes, and all integrity protection mechanisms supported by that connection in the SA†. All this information is exchanged between the two computers using digital signatures and message authentication codes (MACs). Easttom (2006) defines a digital signature as any accessional data included in a message, containing an e-mail addendum, used to corroborate the authenticity of the sender of the message. They are anchored on private and public encryption keys and use digital certificates (DCs), provided by Certificate Authorities (CAs). CAs use information supplied to them to generate the digital certificate, with an encrypted private key for the requester. Kyburz (2010) asserts that, the receiver of a signature will apply the signer’s public key in the decryption and verification of the signature. Where the public key is unknown, it can be requested through a certificate request (CR). According to Mason (2002), there are two distinct phases in an IKE protocol. Phase one includes the fabrication of an authenticated and secure channel, amid the two computers, that is called the IKE Securi ty Association, by the Diffie-Hellman key correspondence being performed. In the second phase, IKE negotiates the IPsec security associations and yields the preferred keying material. Kyburz (2010) notes that, â€Å"the generated key material is transferred to the IPsec, which tracks and supervises the security of all the subsequent communication channels†. The mechanisms that IKE uses to encrypt and authenticate all forms of communications between the initiator and responder are either symmetric or asymmetric. In an asymmetric key encryption system, one key referred to as the public key, is availed to everybody, and is used to encrypt a message, but only the recipient has got the private key to decrypt the message/data.Advertising Looking for assessment on it? Let's see if we can help you! Get your first paper with 15% OFF Learn More On the other hand, a symmetric data encryption, also referred to as conventional data encryption, uses a common key to encrypt an d decrypt data. The types of conventional encryption methods fall under the Extensible Authentication Protocols (EAPs) and include; Data Encryption Standard (DES), Advanced Encryption Standard (AES), International Data Encryption Standard (IDEA) among others. These are discussed below. DES uses short keys and relies on sophisticated procedures to encrypt a large amount of data quickly and efficiently, resulting in scrambled data which is difficult to decrypt without the decryption code. Initially, the data is divided into 64-bit blocks which undergo permutation. The permuted data is then manipulated by sixteen separate steps of encryption involving bit-shifting, substitutions and logical operations using a 56-bit key. It is then scrambled using a swapping algorithm, after which the scrambled data is transposed again. It is a fast method that uses sophisticated algorithms to encrypt data. An improved version of the method- referred to as triple DES or simply DES-3 is available. It re peats the encryption procedure three times, coming up with a more complex encryption of the data, thus increasing data security. AES uses the rijndael algorithm to encrypt the data. It specifies 128-bit, 192-bit and 256-bit keys for its encryptions. It utilizes a block cipher and is considered a very secure encryption method. IDEA works with 64-bit blocks of data, two at a time and produces 128-bit keys. It uses sub-keys generated from the main key to perform modular arithmetic and XOR operations to encrypt the data. Kyburz (2010) identifies some weaknesses inherent in IKE. They include; Penultimate authentication flaws- where an active adversary intercepts data exchange between two computers trying to set up SAs. This results in attacks against session key secrecy, leading to impersonation in a communique. There is also random reveal weakness, whereby an active adversary is able to derive keys from both peers. It is also vulnerable to Key Compromise Impersonation attacks, in instan ces where an attacker is able to access long-term secret keys of a particular computer. Kyburz (2010) also includes identity protection and resource exhaustion as other limitations of IKE. Mason (2002) highlights the following advantages of Internet Key Exchange that make it a secure method for key exchange; IKE protocol allows for perfect forward secrecy, which ensures superior endurance to cryptographic attacks.Advertising We will write a custom assessment sample on Internet Key Exchange specifically for you for only $16.05 $11/page Learn More Kyburz (2010) on the other hand notes that IKE is able to protect the two computers against man-in-the-middle attack, inherent in the standard Diffie-Hellman protocol, since even the Diffie-Hellman key exchanges are encapsulated in IKE protocol. In addition, IKE also integrates traffic selectors which permit a superior IPsec policy negotiation based on IP address and port. References Easttom, C. (2006). Network defense and countermeasures: Principles and practices. Upper Saddle River, N.J: Pearson. Balitanas, M., Kang, B. (2009). Vulnerabilities of VPN using IPSec and Defensive Measures. International Journal of Advanced Science and Technology,volume 8, 306-791. Web. Kyburz, A. (2010). An automated formal analysis of the security of the Internet Key Exchange (IKE)-Protocol in the presence of compromising adversaries. (Master’s Thesis). Swiss Federal Institute of Technology, Zurich. Retrieved from https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/152399/eth-2226-01.pdf Mason, A. (2002). VPNS and VPN Technologies. Retrieved from Ciscopress.com: http://www.ciscopress.com/ This assessment on Internet Key Exchange was written and submitted by user Cloud 9 to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

A Separate Peace and The Catcher in the rye symbols essays

A Separate Peace and The Catcher in the rye symbols essays Introductory Statement: In the book The Catcher in the Rye, written by J.D. Salinger and in the novel A Separate Peace, by John Knowles, there are many significant symbols throughout both books. In Merriam-Webster Dictionary, symbolism is defined as artistic imitation or invention that is a method of revealing or suggesting immaterial, ideal, or otherwise intangible truth or states. Both Salinger and Knowles display meaningful symbols throughout their novels that give the reader a better understanding of the intentions and meanings which are revealed throughout the novels. Thesis Statement: Both Salinger and Knowles display meaningful symbols throughout their novels that give the reader a better understanding of the intentions and meanings which are revealed throughout the novels. @ What I have to do, I have to catch . . .but thats the only thing Id really like to be (Pg 173) B: This is a people shooting. . . I shoot people in this hat (Pg 22) C: Finny, his balance gone, swung his head to look at me for an instant with extreme interest, and then he tumbled sideways, broke through the little branches below and hit the bank with a sickening, unnatural thud" (Pg 52). D: We had never used this lower river . . . and into the turbid Naguamsett. (Pg 68) Paragraph 1 (Topic Sentence) @ Holdens desire to be The Catcher in the Rye has symbolic meaning of his need to stop the transition from childhood innocence to falling off the cliff and becoming a phony. Paragraph 2 (Topic Sentence) B: Holdens Red Hunting cap symbolizes his isolation and need to run from society when turned to the front, as well as his need of protection of childhood innocence, as if he is a catcher when his hat is turned to the back. Paragraph 3 (Topic Sentence) C: Finnys fall represents the fall from innocence, and ...

Charles Goodyear - The History of Vulcanized Rubber

Charles Goodyear - The History of Vulcanized Rubber Caoutchouc was the name for rubber used by the Indians of Central and South America. History of Caoutchouc Besides pencil erasers, rubber was used for many other products, however, the products were not standing up to extreme temperatures, becoming brittle in winter. During the 1830s, many inventors tried to develop a rubber product that could last year-round. Charles Goodyear was one of those inventors, whose experiments put Goodyear into debt and involved in several patent lawsuits. Charles Goodyear In 1843, Charles Goodyear discovered that if you removed the sulfur from rubber then heated it, it would retain its elasticity. This process called vulcanization made rubber waterproof and winter-proof and opened the door for an enormous market for rubber goods. Rubber Bands - On March 17, 1845, the first rubber band was patented by Stephen Perry of London, made from vulcanized rubber. Perry owned the manufacturing company Messers Perry and Co., of London, England.Elastic FabricsEraserHeelHoseRubber Soled ShoesRubber Stamp InventionBalloonsTiresVulcanized Rubber On June 24, 1844, Charles Goodyear was granted patent #3,633 for vulcanized rubber.

Alternative media Case Study Example | Topics and Well Written Essays - 250 words - 1

Alternative media - Case Study Example It’s obvious this is a subtle dig at the propensity of tobacco to be a cancer causing agent. In other such co-optations Adbuster’s parodied Tiger Woods as a picture of the Nike logo in the background was featured and then a swoosh sign within Tiger Wood’s mouth was inserted. The implications for this are clear, as it demonstrates a political commentary on the means by which Nike has purchased Wood’s advertising power and voice. Another image has the slogan ‘Buy Nothing Day’ with a giant credit card running down the street displayed. In these regards, there are ultimately two means of constructing these forms of alternative commercialization. The first being the alteration of existing imagery in an effort to play on the power effects contained in these images. The second method is the direct construction of methods that call into question mainstream social ideals, for instance consumerism. References "Culture Jammers." Adbusters. N.p., 2011. We b. 7 Apr 2011. .

My Father's Life Essay Example | Topics and Well Written Essays - 750 words

My Father's Life - Essay Example His mother felt the need for change and so to upgrade him from their not so good financial background, sent him off to a school in San Francisco, where he was to put up with an aunt while attending a public school since she could not afford him the luxury of studying in a private school. The Second World War broke out while my father was still in school, and like most of his friends and all young strong and loyal men of the day, he was drafted into the army to fight for the cause of the nation he believed in. There, he drove an ambulance though his preference was to fight in the front line. He could penetrate war fields and employ skills and extraordinary tactic in missions to rescue injured solders, and once, he almost got himself killed when the ambulance he was driving was bombed by an enemy tanker missile while on a rescue mission to save the life of some seriously injured colleagues. His friends said that his cleverly wit survived him through the war. Immediately after the war, my father returned to Connecticut and decided to settle there. He later met my mother, a shy strong girl from Jamaica, with a large doze of innocent and a tremendous appetite. My father always said that he fell for her because of that gigantic appetite. They got married in a local church and were blessed with two kids: my sister and I. We grew up fast and all took after their father's strength and an outgoing character. As a young couple, my parents loved bowling and so they spent most of their spare time together on the game. My father liked partying a lot, and I can recall once my mother referring to him as a 'party animal' after he came home drank after a night of partying and playing cards with his friends. He worked hard though, and he always had two jobs going, at a minimum, all the days of his youthful life. For example, I remember he took a job as a factory worker for eight hours ever day and then took a four hour break then reported for another job in an apartment store for another six hours. Despite the heavy responsibility of supporting his young wife and the kids, he managed well enough and placed us in good private schools and at the same time affording him self a good and exciting life. He loved baseball and at one point he trained a local club which never did too well anyway. My mom once told me that after my sixth birthday, dad thought that I was old enough to know the game and so he took me along for a trial on the league. Mum came along to watch her men play. She recalls that the ball came to me and as I struggled to concentrate on the ball so had that I missed and it hit me on the face, right between my eyes, I was so embarrassed. He was a good father and had time for the kids, taking them swimming twice every week and for ice cream every Sunday afternoon. They would take the 'wife' along once in a blue moon just to keep the whining away for lack of due attention from the hubby. Sometime in her late thirties, in his late forties, one of my father's friends offered him the chance to cruise on a cruiser leaving Florida to the island. My father's wish has always been to be able to support his family without having to rely on either loans or on borrowing from the family. And so he took the

Emily Dickinson Essay Example for Free

Emily Dickinson Essay Emily Dickinson, one of the best-known American poetesses, was born in Amherst, western Massachusetts in the 1830. The house where poetess spent the greatest part of her lifetime was called the Homestead. It was built in the 1803 by her grandfather, sold and then bought out in the 1855. Her parents both graduated from the Amherst College. Emily’s father was a well-known person in the town, as he was a treasurer of Amherst College (which was earlier co-founded by her grandfather), a good lawyer and he also was a republican representative to the national legislatures. It is said that Emily’s mother didn’t play an important role in her life, as she couldn’t provide her daughter with the amount of emotions and attention she needed. The poetess herself later referred to her as a sort of a person â€Å"to whom you hurry when you are troubled†. Her early years she spent accompanied by her younger sister Lavinia and a brother whose name was Austin. Her parents, who both were the members of the orthodox Congregational Church, tried to make of her an educated and religious woman who someday will have to take care of her own family. But it became evident later that Emily’s individualistic approach to life, her certain personal features didn’t allow her to perform the social role that was prescribed for the women of her social status at that times. Emily received good education, especially for a women living in the 19th century. First she studied in the Amherst women’s academy and than she spent a year in a Mount Holyoke Female Seminary. Both the first and the second educational establishment devoted endless hours to religious edifications, so the poet’s growing up occurred under the severe religious pressure. At the academy she became notorious as one of the few students who refused to admit her faith in Christ on public. This fact darkened her further sojourn in that establishment, as Emily felt alienated and misunderstood at the place, where everybody shared the beliefs she didn’t fully support. Although she participated in the agency of the community of the Christian resurgence, she failed to become a convinced believer and didn’t join the church community. In 1955 during Emily’s travel to Washington to visit her father, who was a congressman at that period, she stopped at Philadelphia to listen the sermon of the known priest whose name was Charles Wadsworth. She corresponded with him for a long period of time and he is presumed to be Emily’s first love, one of her deeply hidden romantic disappointments which inspired her writings. Another Emily’s presumable object of passion was Samuel Bowles, the editor of the â€Å"Springfield Republican†. Today some researchers say that Dickinson stayed unmarried because of the well hidden passion she had for women. They support their viewpoint giving the feministic analysis of her verses. They also note that Emily kept very close relationship with some of her friends who were woman, and only the strict traditions and beliefs of her time didn’t allow Emily to reveal her real passions. These researchers give us the information that the poetess’s letters to her friend and sister-in-law Susanne Gilbert were thoroughly edited before publishing by her niece, to exclude all the â€Å"passionate love confessions† from there. Other scientists explain the fact of Dickinson being single by some of her personal traits which made marriage undesirable for her. Emily was said to be very careful choosing friends and some people think that she just couldn’t find a man she could live with. Some of the researchers think that the poetess’s desire to stay unmarried was dictated by the customs which existed in the USA at those times. It was acceptable for a women to stay a spinster and to â€Å"keep the house† for the rest of her life. So, both Emily and her sister Lavinia didn’t have husbands. The only member of that family whose love life was successful was their brother Austin. He married a â€Å"genteel† girl from New-York, Susanne Gilbert who later became one of the closest Emily’s friends. Dickinson kept corresponding with some of her friends and relatives for all her life. What is interesting is that she often wrote and received letters from her next door neighbor Susanne Dickinson, her brother’s wife. Emily’s letters are a valuable source that provides us with the information about her personality, character, and attitudes and, what is also important, her life patterns. Emily’s most productive years were 1858-1863, when the number of the poems written enlarged from 52 in the 1858 to the 366 in the 1852. Researches strongly argue on the reason of such productivity increase and most of them agree that there was some failed love affair in Emily’s life in the late fifties. The efforts to define the object of her interest failed. Assumptions made on this topic touched almost everybody with whom Emily communicated closely, including her brother, Susan Gilbert, her sister-in-law, Thomas Wentworth Higginson, Judge Otis Lord, Charles Wadsworth and her friend Kate Scott Anthon, but no evidence of Dickinson having a romantic affair with anyone of these people is not found yet. It is known that Emily didn’t strive for the publicity at all. Only ten of her verses were published during her life and all of these under the pseudonym. Some even think that the poetess didn’t give her permission for the publication. A data exists that she was offered by Thomas Niles of Roberts Brothers publishing house to publish her book in 1883 but refused him. It is presumed that Emily valued her privacy very much and she didn’t like the idea of becoming a well-known person. Instead of printing and publishing her books Emily Dickinson made manuscripts, which were later called fascicles, by herself. She begun to make them in 1958 and only death stopped her work. She shared her work in the narrow circle of her friends and relatives. Emily Dickinson was known for being an eccentric person throughout the dwellers of Amherst. From the 1970 she never wore anything except white dresses and she rarely went out of her yard. The poet rarely communicated with anyone except her family and those who wanted to talk to her had pass the â€Å"face-control† made by her sister Lavinia on Emily’s request. It seems that her inner world was so tender and vulnerable that it was hard for her to let a new person to enter there. Emily chose her surroundings carefully, but she gave all her love and affection to those whom she found worthy of trust. Emily died in the 1886, presumably of some kind of kidney’s disease. Her sister was astonished when she found more than a thousand verses stashed in the wooden bureau in Dickinson’s cabinet. Three volumes of Emily’s poems were published by Lavinia, but she of course couldn’t enjoy her triumph or oppose to those who criticized her. But it seems to me it wouldn’t grieve her, as she said everything she wanted to say in her verses. She made her manifest to the world and now it’s our turn.

Emmanuel Kants Ethics Essay -- essays research papers

As we discussed in class on Monday night, Kant’s main argument in the first section was dedicated to developing his belief that a rational beings have the capacity to reason and through this reason comes a beings ability to know what is right or wrong. Also, Kant revealed that a beings also have an inherent desire to keep themselves save physically and strive for happiness. Yet, these desires or needs can be fulfilled with pure instinct and that reason does not need to be used in order to reach those goals. More specifically Kant says, â€Å"The highest purposes of each individual are presumably self-preservation and the attainment of happiness.† â€Å"The fact that reason serves purposes that are higher than individual survival and private happiness.† This tells us the reason for Kant explaining t...