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Needham–Schroeder Protocol
The Needham–Schroeder protocol is one of the two key transport protocols intended for use over an insecure network, both proposed by Roger Needham and Michael Schroeder. These are: * The ''Needham–Schroeder Symmetric Key Protocol'', based on a symmetric encryption algorithm. It forms the basis for the Kerberos protocol. This protocol aims to establish a session key between two parties on a network, typically to protect further communication. * The ''Needham–Schroeder Public-Key Protocol'', based on public-key cryptography. This protocol is intended to provide mutual authentication between two parties communicating on a network, but in its proposed form is insecure. The symmetric protocol Here, Alice (A) initiates the communication to Bob B. S is a server trusted by both parties. In the communication: * A and B are identities of Alice and Bob respectively * is a symmetric key known only to A and S * is a symmetric key known only to B and S * N_A and N_B are nonces gener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Symmetric Protocol
''The'' () is a grammatical article in English, denoting persons or things already mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is the definite article in English. ''The'' is the most frequently used word in the English language; studies and analyses of texts have found it to account for seven percent of all printed English-language words. It is derived from gendered articles in Old English which combined in Middle English and now has a single form used with pronouns of any gender. The word can be used with both singular and plural nouns, and with a noun that starts with any letter. This is different from many other languages, which have different forms of the definite article for different genders or numbers. Pronunciation In most dialects, "the" is pronounced as (with the voiced dental fricative followed by a schwa) when followed by a consonant sound, and as (homophone of pronoun ''thee'') when followed by a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Symmetric-key Cryptography
Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both the encryption of plaintext and the decryption of ciphertext. The keys may be identical, or there may be a simple transformation to go between the two keys. The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link. The requirement that both parties have access to the secret key is one of the main drawbacks of symmetric-key encryption, in comparison to public-key encryption (also known as asymmetric-key encryption). However, symmetric-key encryption algorithms are usually better for bulk encryption. They have a smaller key size, which means less storage space and faster transmission. Due to this, asymmetric-key encryption is often used to exchange the secret key for symmetric-key encryption. Types Symmetric-key encryption can use either stream ciphers or block ciphers. * Stream ciphers encrypt the digi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Key Transport Protocols
Key or The Key may refer to: Common meanings * Key (cryptography), a piece of information that controls the operation of a cryptography algorithm * Key (lock), device used to control access to places or facilities restricted by a lock * Key (map), a guide to a map's symbology * Key (music), a group of pitches in a piece * Key, on a typewriter or computer keyboard * Answer key, a list of answers to a test Geography * Cay, also spelled key, a small, low-elevation, sandy island formed on the surface of a coral reef United States * Key, Alabama * Key, Ohio * Key, West Virginia * Keys, Oklahoma * Florida Keys, an archipelago of about 1,700 islands in the southeast United States Elsewhere * Rural Municipality of Keys No. 303, Saskatchewan, Canada * Key, Iran, a village in Isfahan Province, Iran * Key Island, Tasmania, Australia * The Key, New Zealand, a locality in Southland, New Zealand Arts and media Films * ''The Key'' (1934 film), a 1934 film directed by Michael Curtiz * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Authentication Protocols
An authentication protocol is a type of computer communications protocol or cryptographic protocol specifically designed for transfer of authentication data between two entities. It allows the receiving entity to authenticate the connecting entity (e.g. Client connecting to a Server) as well as authenticate itself to the connecting entity (Server to a client) by declaring the type of information needed for authentication as well as syntax. It is the most important layer of protection needed for secure communication within computer networks. Purpose With the increasing amount of trustworthy information being accessible over the network, the need for keeping unauthorized persons from access to this data emerged. Stealing someone's identity is easy in the computing world - special verification methods had to be invented to find out whether the person/computer requesting data is really who he says he is. The task of the authentication protocol is to specify the exact series of steps n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brady Haran
Brady John Haran (born 18 June 1976) is an Australian-British independent filmmaker and video journalist who produces educational videos and documentary films for his YouTube channels, the most notable being ''Periodic Videos'' and '' Numberphile''. Haran is also the co-host of the'' Hello Internet'' podcast along with fellow educational YouTuber CGP Grey. On 22 August 2017, Haran launched his second podcast, called ''The Unmade Podcast'', and on 11 November 2018, he launched his third podcast, ''The Numberphile Podcast'', based on his mathematics-centered channel of the same name. Reporter and filmmaker Brady Haran studied journalism for a year before being hired by ''The Adelaide Advertiser''. In 2002, he moved from Australia to Nottingham, United Kingdom. In Nottingham, he worked for the BBC, began to work with film, and reported for ''East Midlands Today'', BBC News Online and BBC radio stations. In 2007, Haran worked as a filmmaker-in-residence for Nottingham Science ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neuman–Stubblebine Protocol
The Neuman–Stubblebine protocol is a computer network authentication protocol designed for use on insecure networks (e.g., the Internet). It allows individuals communicating over such a network to prove their identity to each other. This protocol utilizes time stamps, but does not depend on synchronized clocks. The protocol If Alice (A) initiates the communication to Bob (B) with S is a server trusted by both parties, the protocol can be specified as follows using security protocol notation: * A and B are identities of Alice and Bob respectively * M is a session identifier * K_ is a symmetric key known only to A and S * K_ is a symmetric key known only to B and S * N_A and N_B are nonces generated by A and B respectively * T_A and T_B are timestamps generated by A and B respectively * K_ is a generated symmetric key, which will be the session key of the session between A and B A \rightarrow B: A, N_A :Alice notified Bob of intent to initiate secure communication. B \rightarr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wide Mouth Frog Protocol
The Wide-Mouth Frog protocol is a computer network authentication protocol designed for use on insecure networks (the Internet for example). It allows individuals communicating over a network to prove their identity to each other while also preventing eavesdropping or replay attacks, and provides for detection of modification and the prevention of unauthorized reading. This can be proven using Degano. The protocol was first described under the name "The Wide-mouthed-frog Protocol" in the paper "A Logic of Authentication" (1990), which introduced Burrows–Abadi–Needham logic, and in which it was an "unpublished protocol ... proposed by" coauthor Michael Burrows. Burrows, Abadi, and Needham"A Logic of Authentication" ''ACM Transactions on Computer Systems'' 8 (1990), pp. 18–36. The paper gives no rationale for the protocol's whimsical name. The protocol can be specified as follows in security protocol notation: [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yahalom (protocol)
Yahalom is an authentication and secure key-sharing protocol designed for use on an insecure network such as the Internet. Yahalom uses a trusted arbitrator to distribute a shared key between two people. This protocol can be considered as an improved version of Wide Mouth Frog protocol (with additional protection against man-in-the-middle attack), but less secure than the Needham–Schroeder protocol. Protocol description If Alice (A) initiates the communication to Bob (B) with S is a server trusted by both parties, the protocol can be specified as follows using security protocol notation: * A and B are identities of Alice and Bob respectively * K_ is a symmetric key known only to A and S * K_ is a symmetric key known only to B and S * N_A and N_B are nonces generated by A and B respectively * K_ is a symmetric, generated key, which will be the session key of the session between A and B A \rightarrow B: A, N_A :Alice sends a message to Bob requesting communication. B \rightarro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otway–Rees Protocol
The Otway–Rees protocol is a computer network authentication protocol designed for use on insecure networks (e.g. the Internet). It allows individuals communicating over such a network to prove their identity to each other while also preventing eavesdropping or replay attacks and allowing for the detection of modification. The protocol can be specified as follows in security protocol notation, where Alice is authenticating herself to Bob using a server S (M is a session-identifier, NA and NB are nonces): # A \rightarrow B: M,A,B,\_ # B \rightarrow S: M,A,B,\_,\_ # S \rightarrow B: M,\_,\_ # B \rightarrow A: M,\_ Note: The above steps do not authenticate B to A. This is one of the protocols analysed by Burrows, Abadi and Needham in the paper that introduced an early version of Burrows–Abadi–Needham logic. Attacks on the protocol There are a variety of attacks on this protocol currently published. Interception attacks These attacks leave the intruder with the session ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gavin Lowe (computer Scientist)
Gavin Lowe is a British academic. He is a professor of computer science and tutorial fellow at St Catherine's College, Oxford, a professor at the University of Oxford, and President of the Senior Common Room of St Catherine's College, Oxford. His research interests include computer security, for which he developed the cryptographic protocol analysis tool Casper, and concurrency. Education Lowe studied mathematics as an undergraduate at St John's College, Oxford, then took an MSc in computation at the University of Oxford. He undertook a DPhil at St Hugh's College, Oxford, writing a thesis titled ''Probabilities and Priorities in Timed CSP''. He published a paper detailing an attack on the Needham–Schroeder protocol, as well as a method to fix the issue, in 1995. The fixed version of the protocol described in the paper is referred to as the Needham–Shroeder–Lowe protocol. Career His research interests have included computer security, for which he developed the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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