There are several newsgroup s relevant for discussions about cryptography and related issues. news sci.crypt sci.crypt &mdash an unmoderated forum for discussions on technical aspects of cryptography . news sci.crypt.research sci.crypt.research &mdash a similar, Usenet newsgroup Moderated newsgroups moderated group, focusing on research into cryptography. It was founded based on a charter by Peter Gutmann computer scientist Peter Gutmann . news sci.crypt.random numbers sci.crypt.random numbers &mdash discuss Cryptographically secure pseudorandom number generator generation of cryptographically secure random number s. news talk.politics.crypto talk.politics.crypto &mdash discussions of the relationship between cryptography and government. The original charter was by D.J. Silverton. news alt.security.pgp alt.security.pgp &mdash discussion of Pretty Good Privacy PGP and related software. sci.crypt In 1995, Bruce Schneier commented, It is read by an estimated 100,000 people worldwide. Most of the posts are nonsense, bickering, or both some are political, and most of the rest are requests for information or basic questions. Occasionally nuggets of new and useful information are posted to this newsgroup. PracticalCryptography Less mathematical Applied Cryptography , 2nd ed, pages 608 609 . Leaked descriptions of secret algorithms have been posted to the Internet via sci.crypt, for example RC2 , RC4 cipher RC4 and Khufu and Khafre . Others have been hoaxes Iraqi block cipher and S 1 block cipher S 1 , the latter an alleged description of the then secret Skipjack cipher Skipjack cipher. The group is also the origin of the term, Rubber hose cryptanalysis . External links http www.alt security keydist.info newsgroups Newsgroups for cryptography http www.faqs.org faqs cryptography faq sci.crypt Frequently Asked Questions crypto stub Category Cryptography journals Category Sci. hierarchy fr Groupes de discussion sur la cryptologie ... more details
cryptography. Niels Ferguson Ferguson, Niels , and Bruce Schneier Schneier, Bruce PracticalCryptography ... work. PracticalCryptography also includes some contextual material in the discussion ... on cryptology . Books on cryptography have been published sporadically and with highly variable ... in cryptography and secure information transfer communications of the last 25 years when reason WP ... of a book about cryptography was a Roman work, now lost and known only by references. Many early cryptographic works were esoteric, mystical, and or reputation promoting cryptography being mysterious .... Friedman William Friedman in the early 20th century also wrote books on cryptography. These authors ... to protect communications. By the end of World War I , cryptography and its literature began to be officially ... century most aspects of modern cryptography were regarded as the special concern of governments ... work to be published on cryptography in this period is undoubtedly David Kahn writer David Kahn s The Codebreakers ... practice of cryptography was available. Kahn has said that over ninety percent of its content was previously .... List Merge to List of important publications in cryptography date October 2011 Significant books on cryptography include Helen Fouch Gaines Gaines, Helen Fouch Cryptanalysis , 1939, Dover, ISBN ... as one of the first projects of the American Cryptogram Association . Dominic Welsh Codes and Cryptography ... , Rowman & Littlefield, ISBN 0 8476 7438 X Konheim, Alan G. 1981 . Cryptography A Primer , John ... and Yehuda Lindell s Introduction to Modern Cryptography , ref http www.cs.umd.edu jkatz imc.html ref CRC Press. Presents modern cryptography at a level appropriate for undergraduates, graduate students ... science background. Mao, Wenbo 2004 . Modern Cryptography Theory and Practice ISBN 0 13 066943 1. An up to date book on cryptography. Touches on provable security, and written with students and practitioners in mind. Douglas Stinson Cryptography Theory and Practice ISBN 1 58488 508 4. Covers ... more details
Use dmy dates date August 2010 More footnotes date July 2009 The history of cryptography began thousands of years ago. Until recent decades, it has been the story of what might be called classical cryptography classic cryptography that is, of methods of encryption that use pen and paper, or perhaps simple .... The development of cryptography has been paralleled by the development of cryptanalysis the breaking ... cryptography was largely the preserve of governments. Two events have since brought it squarely into the public ... of public key cryptography . Classical cryptography See also Classical cipher The earliest known use of cryptography is found in non standard Egyptian hieroglyphs hieroglyphs carved into monuments ... history.htm A Brief History of Cryptography. CYCOM Cypher Research Laboratories.24 Jan. 2006 ref ... These are examples of still other uses of cryptography, or of something that looks impressively if misleadingly ... http cryptozine.blogspot.com 2008 05 brief history of cryptography.html A Brief History of Cryptography .... A Short History of Cryptography. 1995. ref Image Skytala&EmptyStrip Shaded.png thumb 199px right ... examples of cryptography per se as the message, once known, is directly readable ... Cryptography Polybius Square . ref name Cohen The Ancient Rome Romans knew something of cryptography e.g., the Caesar cipher and its variations . Medieval cryptography File Al kindi cryptographic.gif ... . It was the most fundamental cryptanalytic advance until WWII. Al Kindi wrote a book on cryptography ... lived from 1312 to 1361, but whose writings on cryptography have been lost. The list of ciphers in this work ... devised a practical poly alphabetic system which bears his name, the Vigen re cipher . ref name cypher http www.cypher.com.au crypto history.htm History of Cryptography ref In Europe, cryptography ... may be inherent in cryptography for it was then, and remains today, fundamentally difficult ..., as may be expected, are common. Cryptography, cryptanalysis , and secret agent courier betrayal ... more details
Possible practical application of Neural Cryptography. http www.springerlink.com content kbpxkbnkgtk4ymhh Analysis of Neural Cryptography Analysis of neural cryptography in general and focusing ...Neural cryptography is a branch of cryptography dedicated to analyzing the application of stochastic algorithms, especially neural network algorithms, for use in encryption and cryptanalysis . Definition Neural Networks are well known for their ability to selectively explore the solution space of a given problem. This feature finds a natural niche of application in the field of cryptanalysis . At the same time, Neural Networks offers a new approach to attack ciphering algorithms based on the principle ... can be used for different aspects of cryptography, like public key cryptography , solving the Key cryptography ... Cryptography and Neural Cryptography. The first work that it is known on this topic can be traced back to 1995 in an IT Master Thesis. Applications As of yet there no practical applications due to the recent ... of neural cryptography, we improve it by increasing of the synaptic depth L of the neural networks ... name Klimov http cryptome.org neuralsub.ps Analysis of Neural Cryptography by Alexander Klimov, Anton ...?sl fr&tl en&u http 3A 2F 2Fs.dourlens.free.fr 2Fmaitrise 2Fmaitrise.htm Neuro Cryptography 1995 The first definition of the Neuro Cryptography AI Neural Cryptography applied to DES cryptanalysis by Sebastien Dourlens, France. http theorie.physik.uni wuerzburg.de ruttor neurocrypt.html Neural Cryptography Description of one kind of neural cryptography at the University of W rzburg , Germany. http ... uni wuerzburg volltexte 2007 2361 Neural Synchronization and Cryptography Andreas Ruttor. PhD thesis ... Kinzel, Rivka Naeh, and Ido Kanter year 2006 title Genetic attack on neural cryptography journal ... Science 2 pages 710&ndash 715 url http www.scipub.org fulltext jcs jcs29710 715.pdf Cryptography navbox Category Theory of cryptography Category Neural networks ru ... more details
saved book title Cryptography subtitle cover image Jules verne cryptogramme.png cover color rgb 255,255,255 Cryptography Overview Cryptography Cryptanalysis History of cryptography Classical cryptography Caesar cipher Substitution cipher Transposition cipher Vigen re cipher One time pad Modern cryptography Symmetric key algorithm Public key cryptography Cryptographic hash function Major symmetric key algorithms Stream cipher Block cipher RC4 Data Encryption Standard Advanced Encryption Standard Feistel cipher Major public key systems RSA algorithm RSA Diffie Hellman key exchange Elliptic curve cryptography NSA Suite B Cryptography Cryptographic hash functions MD5 SHA 1 SHA 2 NIST hash function competition SHA 3 Message authentication code Key management Key cryptography Cryptographic key Key management Key size Public key infrastructure Web of trust Cryptanalysis Frequency analysis Cryptanalysis of the Enigma Man in the middle attack Differential cryptanalysis Side channel attack Random number generator attack Rainbow table Applications of cryptography Transport Layer Security Pretty Good Privacy GNU Privacy Guard Digital signature Digital rights management Cipher machines Jefferson disk Enigma machine Purple cipher machine The Purple cryptographic machine SIGABA KL 7 Fialka NSA encryption systems Voice encryption SIGSALY STU III Secure Terminal Equipment Secure Communications Interoperability Protocol Category Cryptography books ... more details
unreferenced date April 2010 ambox type move text A majority of the content was moved to Export of cryptography in the United States on 19 January 2010 The export of cryptography is the transfer from one country to another of devices and technology related to cryptography . Note Copied from Expor of cryptography in the United States In the early days of the Cold War , the U.S. and its allies developed an elaborate series of export control regulations designed to prevent a wide range of Western technology from falling into the hands of others, particularly the Eastern bloc . All export of technology classed as critical required a license. CoCom was organized to coordinate Western export controls. Currently, many countries, notably those participating in the Wassenaar Arrangement , have similar restrictions. Citation needed date March 2009 See also Export of cryptography in the United States Restrictions on the import of cryptography crypto stub DEFAULTSORT Export Of Cryptography Category Cryptography law Category Computer law Category Export and import control it Esportazione della crittografia ... more details
Infobox Encryption method name Panama image caption designers Joan Daemen , br Craig Clapp publish date February 2002 series derived from StepRightUp derived to MUGI related to certification key size 256 bits security claim state size structure rounds cryptanalysis Panama hash collisions can be generated in 2 sup 6 sup time. Panama is a cryptography primitive which can be used both as a hash function and a stream cipher . Based on StepRightUp , it was designed by Joan Daemen and Craig Clapp and presented in the paper Fast Hashing and Stream Encryption with PANAMA on the Fast Software Encryption FSE conference 1998. The cipher has influenced several other designs, for example MUGI . The primitive can be used both as a hash function and a stream cipher . The stream cipher uses a 256 bit key and the performance of the cipher is very good reaching 2 cycles per byte . As a hash function, collisions have been shown by Vincent Rijmen et al. in the paper Producing Collisions for PANAMA presented at FSE 2001. The attack shows a computational complexity of 2 sup 82 sup and with negligible memory requirements. At FSE 2007, Joan Daemen and Gilles Van Assche presented a practical attack on the Panama hash function that generates a collision in 2 sup 6 sup evaluations of the state updating function. Guido Bertoni, Joan Daemen , Micha l Peeters, and Gilles Van Assche proposed, at NIST s 2006 Second Cryptographic Hash Workshop, unveiled a Panama variant called RadioGat n . RadioGat n is strictly a hash function it does not have the known weaknesses that Panama s hash function has. External links http www.quadibloc.com crypto co4821.htm John Savard s page on Panama http radiogatun.noekeon.org panama J. Daemen, G. Van Assche Producing Collisions for Panama Instantaneously Cryptography navbox hash stream Category Stream ciphers Category Broken hash functions fr PANAMA ... more details
being kept secret . Keeping keys secret is one of the most difficult problems in practicalcryptography ...Refimprove date April 2010 In cryptography , a key is a piece of information a parameter that determines the functional output of a cryptographic algorithm or cipher . Without a key, the algorithm would produce no useful result. In encryption , a key specifies the particular transformation of plaintext into ciphertext , or vice versa during decryption . Keys are also used in other cryptographic algorithms, such as digital signature schemes and message authentication code s. Need for secrecy In designing security systems, it is wise to assume that the details of the cryptographic algorithm are already available to the attacker. This principle is known as Kerckhoffs principle only secrecy of the key provides security , or, reformulated as Claude Shannon Shannon s maxim Shannon s maxim , the enemy knows the system . The history of cryptography provides evidence that it can be difficult to keep the details of a widely used algorithm secret see security through obscurity . A key is often easier to protect it s typically a small piece of information than an encryption algorithm, and easier .... The keys used in public key cryptography have some mathematical structure. For example, public keys ... s which aim to have security equivalent to a 128 bit symmetric cipher. Elliptic curve cryptography ... derivation function which adds a Salt cryptography salt and compresses or expands it to the key length ... center Key escrow Key exchange Key generation Key insulated cryptography Key management Key schedule Key server cryptographic Key server Key signature cryptography Key signing party Key stretching Key ... paper key Machine readable paper key Weak key Div col end References references cryptography navbox Interlang Categories Category Cryptography Category Key management bg ca Clau ... Klucz kryptografia pt Chave criptografia ro Cheie criptografie ru simple Key cryptography ... more details
Quantum cryptography describes the use of quantum mechanical effects in particular quantum communication ... of classical i.e., non quantum cryptography to protect against quantum attackers clarify date May 2011 is also often considered as quantum cryptography cn date May 2011 in this case, one also speaks of post quantum cryptography . Well known examples of quantum cryptography are the use of quantum communication ... signature schemes e.g., RSA algorithm RSA and ElGamal . The advantage of quantum cryptography lies ... Hughes and Jane Nordholt title Refining Quantum Cryptography journal Science pages 1584 6 volume ... Main Quantum key distribution Arguably the best known application of quantum cryptography ... is the only example of commercially available quantum cryptography. ref cite web url http www.idquantique.com ... data. Position based quantum cryptography The goal of position based quantum cryptography is to use ..., this result does not exclude the possibility of practical schemes in the bounded or noisy quantum storage model see above . Post quantum cryptography In a predictive sense, quantum computers ... is often referred to as post quantum cryptography. The need for post quantum cryptography arises ... s knowledge, secure against quantum adversaries are McEliece and Lattice based cryptography lattice based schemes. Surveys of post quantum cryptography are available. ref name pqcrypto.org ref ... against practical quantum key distribution systems year 2008 publisher Physical Review A url http ... attack in a practical quantum key distribution system year 2010 publisher New Journal of Physics ... title Hacking commercial quantum cryptography systems by tailored bright illumination year 2010 publisher ... name thermalblinding cite conference title Thermal blinding of gated detectors in quantum cryptography ... Quantum cryptography Public key distribution and coin tossing booktitle Proceedings of IEEE International ... ref ref name kilian88founding cite conference title Founding cryptography on oblivious transfer first ... more details
Below is a timeline of notable events related to cryptography . BCE 36th century The Sumerian language Sumerian s develop Cuneiform script cuneiform writing and the Egyptians develop Egyptian hieroglyphs hieroglyphic writing. 16th century The Phoenicians develop an Phoenician alphabet alphabet 600 500 Hebrew language Hebrew scholars make use of simple monoalphabetic substitution ciphers such as the Atbash cipher c. 400 Spartan use of scytale alleged c. 400 Herodotus reports use of steganography in reports to Greece from Persia tattoo on shaved head 100 1 CE Notable Roman ciphers such as the Caesar ... militare published, containing his celebrated Kerckhoffs principle laws of cryptography 1885 Beale ciphers published 1894 The Dreyfus Affair in France involves the use of cryptography, and its ... coincidence counting, etc. 1917 Gilbert Vernam develops first practical implementation of a teletype ... Chamber by Herbert O. Yardley is published, revealing much about American cryptography 1940 Break of Japan ... publish New Directions in Cryptography . 1977 RSA algorithm RSA public key encryption invented ... Brassard design the first quantum cryptography protocol, BB84 . 1985 Walker spy ring uncovered ... . 1989 Quantum cryptography experimentally demonstrated in a proof of the principle experiment by Charles ... into stealing a universal decoder for encryption systems. 1994 Bruce Schneier s Applied Cryptography ... U.S. Government announce restrictions on export of cryptography are relaxed although not removed . This allows ... 2003 report recommendations 2004 The hash MD5 is shown to be vulnerable to practical collision attack 2004 The first commercial quantum cryptography system becomes available from id Quantique . 2005 Potential ... with copies of a 128 bit key cryptography key to the Advanced Access Content System AACS system ... Timeline Of Cryptography Category Computing timelines Cryptography Category History of cryptography Category Cryptography lists and comparisons fr Histoire de la cryptanalyse ... more details
Financial cryptography FC is the use of cryptography in applications in which financial loss could result from subversion of the message system. Cryptographers think of the field as originating in the work of Dr David Chaum who invented the blind signature blinded signature . This special form of a digital signature cryptographic signature permitted a virtual coin to be signed without the signer seeing the actual coin, and permitted a form of digital token money that offered untraceability. This form is sometimes known as Digital Cash . A widely used and previously developed cryptographic mechanism ... transfers. However, it was the work of David Chaum that excited the cryptography community about the potential of encrypted messages as actual financial instruments . Financial cryptography includes ... of Financial Cryptography. Hashcash is being used to limit spam. Financial cryptography is distinguished from traditional cryptography in that for most of recorded history, cryptography has been used ... of cryptography and only the simplest ideas were adopted. Account money systems protected by Secure ... mechanisms, including blinded token money, were not. Financial cryptography is frequently seen to have a very broad scope of application. Ian Grigg sees financial cryptography in seven layers http iang.org papers fc7.html , being the combination of seven distinct disciplines cryptography, software ... so, given that finance and cryptography are each built upon multiple disciplines. Financial cryptography is to some extent organized around the annual meeting of the International Financial Cryptography Association http www.ifca.ai Financial Cryptography , which is held each year in a different location ... key exchange External links http www.ifca.ai International Financial Cryptography Association http fincrypt.blogspot.com Fincrypt weblog https www.financialcryptography.com Financial Cryptography weblog ... Financial cryptography Category Banking technology ca Criptografia financera es Criptograf a financiera ... more details
In the cryptography sense, a keyring stores known encryption keys and in some cases, passwords . For example, GNU Privacy Guard makes use of keyrings. ref http www.gnupg.org gph en manual.html GPG Privacy Handbook ref References Reflist crypto stub Category Cryptography ... more details
Refimprove date December 2009 Orphan date December 2009 Cryptography is the practice and study of hiding information . There are many different cryptography laws in different nations . Some countries prohibit export of cryptography software and or encryption algorithm s or cryptoanalysis methods. In some countries a license is required to use encryption software, and a few countries ban citizens from encrypting their internet communication. Some countries require decryption keys to be recoverable in case of a police investigation. France As of 2011 and since 2004, the law for trust in the digital economy LCEN ref cite web accessdate June 14, 2011 url http www.legifrance.gouv.fr affichTexte.do?cidTexte JORFTEXT000000801164 title Legifrance.gouv.fr Loi pour la confiance dans l conomie num rique LCEN ref mostly liberalized the use of cryptography. Especially As long as cryptography is only used for authentication and integrity purposes, it can be freely used. The cryptographic key or the nationality of the entities involved in the transaction do not matter. Typical e business websites fall under this liberalized regime. For other uses, exportation and importation to or from foreign countries must be either declared when the other country if a member of the European Union or requires an explicit authorization for other countries . See also Official Secrets Act United Kingdom , India , Ireland , Malaysia and formerly New Zealand Regulation of Investigatory Powers Act 2000 United Kingdom Restrictions on the Import of Cryptography Export of cryptography Key disclosure law United States v. Boucher on right of criminal defendant not to reveal passphrase References Reflist DEFAULTSORT Cryptography Laws In Different Nations Category Cryptography law Law stub ... more details
dablink MAG is also IATA code for Madang Airport Refimprove date August 2008 In cryptography , MAG is stream cipher algorithm developed by Rade Vuckovac . It has been submitted to the eSTREAM Project of the eCRYPT network. It has not been selected for focus, nor for consideration in Phase 2 it has been archived . Cryptography navbox stream Category Stream ciphers crypto stub nl MAG ... more details
In cryptography , GMR is a digital signature algorithm named after its inventors Shafi Goldwasser , Silvio Micali and Ron Rivest . As with RSA algorithm RSA the security of the system is related to the difficulty of Integer factorization factoring very large numbers . But, in contrast to RSA, GMR is secure against adaptive chosen plaintext attack chosen message attack s &mdash even when an attacker receives signatures for messages of his choice, this does not allow him to forge a signature for a single additional message. External links http citeseer.ist.psu.edu goldwasser88digital.html A Digital Signature Scheme Secure Against Adaptive Chosen Message Attacks Shafi Goldwasser, Silvio Micali, Ronald L. Rivest Cryptography navbox public key Category Digital signature schemes Category Lattice based cryptography crypto stub de GMR Signaturverfahren ... more details
Infobox Company company name Cryptography Research, Inc. company logo File Cryptography Research logo.png 142px Cryptography Research, Inc. Logo type Private company Private subsidiary founded 1995 location San Francisco , California key people Paul Kocher , President and Chief Scientist products Technology licensing, secure semiconductors revenue 10M 100M num employees 25 100 homepage http www.cryptography.com www.cryptography.com parent Rambus Cryptography Research, Inc.. is a San Francisco based cryptography company specializing in applied cryptographic engineering, including technologies for building tamper resistant semiconductors. It was purchased on June 6, 2011 by Rambus for more than 250M in cash and stock. ref cite web url http www.rambus.com us news press releases 2011 110606.html title Rambus completes acquisition of Cryptography Research date 2011 06 06 accessdate 2011 06 29 ref The company licenses patents for protecting cryptographic devices against power analysis attacks. ref http www.frost.com prod servlet market insight top.pag?docid 28127384 Ubhey, Anoop, Interview with Cryptography Research Inc , Frost & Sullivan, 23 Nov. 2004. ref The company s CryptoFirewall brand ASIC cores are used in pay TV conditional access systems and anti counterfeiting applications. ref http www.devicelink.com mddi archive 07 10 020.html Maria Fontanezza, Technology Battles Device Cloning , MD&DI, October 2007. ref CRI also developed BD , a security component in the Blu ray disc format, and played a role in the format war between HD DVD and Blu ray . ref http query.nytimes.com gst fullpage.html?res 9B07E7D9103BF936A25757C0A9659C8B63 Markoff, John, Plan Would Use Content, Not Devices .... ref The company s services group assists with security testing, disaster recovery, and training. Cryptography ... prod servlet press release.pag?docid 179970706 Frost & Sullivan Commends Cryptography Research ... Cryptography Research website Category Cryptography companies crypto stub ru Cryptography ... more details
Distinguish Grill cryptology In the history of cryptography , a grille cipher was a technique for encrypting a plaintext by writing it onto a sheet of paper through a pierced sheet of paper or Corrugated fiberboard cardboard or similar . The earliest known description is due to the polymath Girolamo Cardano in 1550. His proposal was for a rectangular stencil allowing single letters, syllables, or words to be written, then later read, through its various apertures. The written fragments of the plaintext could be further disguised by filling the gaps between the fragments with anodyne words or letters. This variant is also an example of steganography , as are many of the grille ciphers. Cardan grille and variations Main Cardan grille The Cardan grille was invented as a method of secret writing. The word cryptography became the more familiar term for secret communications from the middle of the 17th century. Earlier, the word steganography was common. The other general term for secret writing was cypher also spelt cipher . There is a modern distinction between cryptography and steganography Sir Francis Bacon gave three fundamental conditions for ciphers. Paraphrased, these are a cipher ... . It is an area of cryptography that David Kahn termed enigmatology and touches on the works ... as a nomenclator . it was the practical state of the art in his day. The trellis was described as a device ... letters i.e., padding cryptography padding . Messages longer than 64 letters require another turn ... ciphers that are reflected in modern cryptography. Unusual possibilities The d Agapeyeff ... to the turning grille. See also Topics in cryptography References Reflist more footnotes date March ..., The Code Book The Science of Secrecy from Ancient Egypt to Quantum Cryptography , Fourth Estate Limited ... 27158 concept1 4.html title Grille work Classic Cryptography publisher ThinkQuest accessdate ... title Notes on the D Agapeyeff Cipher accessdate 2006 06 05 Cryptography navbox classical DEFAULTSORT ... more details
about the United States government cryptography project other uses Capstone disambiguation Capstone is the name of a United States government long term project to develop cryptography standards for public and government use. Capstone was driven by the National Institute of Standards and Technology NIST and the National Security Agency NSA the project began in 1993 ref Note1 . The initiative involved four standard algorithms a data encrypt encryption algorithm called Skipjack cipher Skipjack , along with the Clipper chip that included the Skipjack algorithm, a digital signature algorithm, Digital Signature Algorithm DSA , a hash function, SHA 1 , and a key exchange protocol. ref Note2 Captstone s first implementation was in the Fortezza PCMCIA card . The initiative encountered massive resistance from the cryptographic community, and eventually the US government abandoned the effort. The main reasons for this resistance were concerns about Skipjack cipher Skipjack s design, which was Classified information classified , and the use of key escrow in the Clipper chip. See also Clipper chip Skipjack cipher Skipjack Fortezza References note Note1 http www.eff.org Privacy Key escrow Clipper wh crypto original.announce Original press release note Note2 http www.rsasecurity.com rsalabs node.asp?id 2317 RSA Laboratories FAQ on Cryptography entry note Note3 http www.eff.org Privacy Key escrow Clipper EFF archives on Capstone crypto stub Category National Security Agency encryption devices Category History of cryptography ... more details
Practical joker may refer to Practical joker person , someone who sets up a situation to produce a humorous physical outcome at the expense of a target The Practical Joker TAS episode The Practical Joker TAS episode , an episode of Star Trek The Animated Series disambig ... more details
procedures sometimes glorified by the phrase practicalcryptography &mdash and this is a weakness for both codes and ciphers, though codebooks are generally larger and used longer than cipher key cryptography ...otheruses2 Code In cryptography , a code is a method used to transform a message into an obscured form so it cannot be understood. Special information or a key cryptography key is required to read the original message. The usual method is to use a codebook with a list of common phrases or words matched with a codeword . Encoded messages are sometimes termed codetext , while the original message is usually referred to as plaintext . Terms like code and in code are often used to refer to any form of encryption . However, there is an important distinction between codes and cipher s in technical work it is, essentially, the scope of the transformation involved. Codes operate at the level of meaning that is, words or phrases are converted into something else. Ciphers work at the level of individual letters, or small groups of letters, or even, in modern ciphers, with individual bits. While a code might transform change into CVGDK or cocktail lounge , a cipher transforms elements below the semantic level, i.e., below the level of meaning. The a in attack might be converted to Q , the first t to f , the second t to 3 , and so on. Ciphers are more convenient than codes in some situations, there being no need for a codebook, with its inherently limited number of valid messages, and the possibility of fast automatic operation on computer s. Codes were long believed to be more secure than ciphers, since if the compiler of the codebook did a good job there is no pattern of transformation which can be discovered, whereas ciphers use a consistent transformation, which can potentially be identified ... part codes. Various tricks can be used to gardening cryptography plant or sow information into a coded ... Category Cryptography da Kode kryptologi it Crittografia pl Kodowanie kryptografia ... more details
PMAC , which stands for Parallelizable MAC , is a message authentication code algorithm. It was created by Phillip Rogaway patent pending . PMAC is a method of taking a block cipher and creating an efficient message authentication code that is provably reducible in security to the underlying block cipher. PMAC is similar in functionality to the OMAC cryptography OMAC algorithm. External links http www.cs.ucdavis.edu rogaway ocb pmac.htm Phil Rogaway s page on PMAC Changhoon Lee, Jongsung Kim, Jaechul Sung, Seokhie Hong, Sangjin Lee. Forgery and Key Recovery Attacks on PMAC and Mitchell s TMAC Variant , 2006. http www.cosic.esat.kuleuven.be publications article 779.ps ps Cryptography navbox hash Category Message authentication codes crypto stub ... more details
Certificateless cryptography is a variant of ID based cryptography intended to prevent the key escrow problem. Ordinarily, keys are generated by a certificate authority or a key generation center KGC who is given complete power and is implicitly trusted. To prevent a complete breakdown of the system in the case of a compromised KGC, the key generation process is split between the KGC and the user. The KGC first generates a key pair, where the private key is now the partial private key of the system. The remainder of the key is a random value generated by the user, and is never revealed to anyone, not even the KGC. All cryptographic operations by the user are performed by using a complete private key which involves both the KGC s partial key, and the user s random secret value. One disadvantage of this is that the identity information no longer forms the entire public key. To encrypt a message to another user, three pieces of information are needed 1 the other user s public key and 2 identity, and also 3 the third party s public information. To decrypt, a user just needs to use their private key. For tight security, a certificateless system has to prove its security against two types of adversaries. Type 1 Adversary Refers to any third party who can fake the user s public keys, corresponding to the user s random secret value. Type 2 Adversary Refers to a compromised or malicious KGC, who has access to the partial public and private keys of all users. References Sattam S. Al Riyami and Kenneth G. Paterson, Certificateless Public Key Cryptography, Lecture Notes in Computer Science , pp. 452 473, 2003 http eprint.iacr.org 2003 126.pdf . Category Public key cryptography Category Identity based cryptography es Criptograf a sin certificados ... more details
Visual cryptography is a cryptography cryptographic technique which allows visual information pictures, text, etc. to be encrypted in such a way that decryption becomes a mechanical operation that does not require a computer. One of the best known techniques has been credited to Moni Naor and Adi Shamir , who developed it in 1994. They demonstrated a visual secret sharing scheme, where an image was broken up into n shares so that only someone with all n shares could decrypt the image, while any n 1 shares revealed no information about the original image. Each share was printed on a separate transparency, and decryption was performed by overlaying the shares. When all n shares were overlaid, the original image would appear. Using a similar idea, transparencies can be used to implement a one time pad encryption, where one transparency is a shared random pad, and another transparency acts as the ciphertext. Example Image Visual crypto animation demo.gif frame right A demonstration of visual cryptography In this example, the Wikipedia logo has been split into two shares. Each white pixel ... shares reveal no information about the original image. 2, N Visual Cryptography Sharing Case Sharing ... parties to cheat an honest party in visual cryptography. They take advantage of knowing the underlying ... other honest parties. References Moni Naor and Adi Shamir, Visual Cryptography, EUROCRYPT 1994, pp1 ... visual cryptography Open source Matlab implementation of Visual Cryptography in Algorito http users.telenet.be d.rijmenants en visualcrypto.htm Visual Cryptography on Cipher Machines & Cryptology http www.cacr.math.uwaterloo.ca dstinson visual.html Doug Stinson s visual cryptography page http www fs.informatik.uni ... create and encode images Horng, G, Tzungher C. and Tasi, D.S. Cheating in Visual Cryptography, Designs, Codes and Cryptography, 2006, pp219&ndash 236 http www.springerlink.com content f468p22hw6382256 ... Category Cryptography crypto stub de Visuelle Kryptographie it Crittografia visuale he ... more details
see also Index of cryptography articles The following outline is provided as an overview of and topical guide to cryptographyCryptography or cryptology &ndash practice and study of hiding information . Modern cryptography intersects the disciplines of mathematics , computer science , and engineering . Applications of cryptography include automated teller machine ATM cards , password computer passwords , and electronic commerce . Essence of cryptography Main article Cryptography Cryptographer &ndash ... &ndash Branches of cryptography Cryptographic engineering &ndash Multivariate cryptography &ndash Quantum cryptography &ndash Steganography &ndash Visual cryptography &ndash History of cryptography main History of cryptography Timeline of cryptography Japanese cryptology from the 1500s to Meiji &ndash World War I cryptography &ndash World War II cryptography &ndash Reservehandverfahren &ndash Venona ... &ndash Grille cryptography Grille &ndash Permutation cipher Permutation &ndash VIC cipher VIC ... Chameleon cipher Chameleon &ndash FISH cipher FISH &ndash by Siemens AG Fish cryptography WWII Fish ... cryptography STURGEON by Bletchley Park Pike cipher Pike &ndash improvement on FISH by Ross J. Anderson ... recommendation El Gamal &ndash discrete logarithm Elliptic curve cryptography &ndash discrete logarithm ... main Key cryptography Authentication main Key authentication Public key infrastructure &ndash X.509 ... ID based cryptography &ndash Certificate based encryption &ndash Secure key issuing cryptography &ndash Certificateless cryptography &ndash Hash tree Merkle tree &ndash Transport exchange Diffie Hellman ... cryptography Salt &ndash Cryptographic hash functions main Cryptographic hash function Message authentication ... &ndash by Ross J. Anderson Ross Anderson et al. Snefru cryptography Snefru &ndash Whirlpool algorithm ... cryptography Malleability &ndash Uncracked codes and ciphers maincat Uncracked codes and ciphers ... projects Standards main Cryptography standards Federal Information Processing Standard s Publication ... more details
There are a number of standardization standards related to cryptography . Standard algorithms and protocols provide a focus for study standards for popular applications attract a large amount of cryptanalysis . Encryption standards Data Encryption Standard DES, now obsolete Triple DES Advanced Encryption Standard AES RSA algorithm RSA the original public key algorithm OpenPGP CipherSaber Hash standards MD5 128 bit obsolescent SHA 1 160 bit SHA 2 available in 224, 256, 384 and 512 bit variants HMAC keyed hash PBKDF2 Key derivation function RFC 2898 Digital signature standards Digital Signature Standard DSS , based on the Digital Signature Algorithm DSA RSA algorithm RSA Public key infrastructure PKI standards X.509 Public Key Certificates Wireless Standards Wired Equivalent Privacy WEP , severely flawed and superseded by WPA Wi Fi Protected Access WPA better than WEP, a pre standard partial version of 802.11i 802.11i a.k.a. WPA2, uses Advanced Encryption Standard AES and other improvements on WEP A5 1 and A5 2 cell phone encryption for GSM U.S. Government Federal Information Processing Standards FIPS FIPS PUB 31 Guidelines for Automatic Data Processing Physical Security and Risk Management 1974 FIPS PUB 46 3 Data Encryption Standard Data Encryption Standard DES 1999 FIPS PUB 73 Guidelines for Security of Computer Applications 1980 FIPS PUB 74 Guidelines for Implementing and Using the NBS Data Encryption Standard 1981 FIPS PUB 81 Data Encryption Standard DES Modes of Operation 1980 FIPS PUB 102 Guideline for Computer Security Certification and Accreditation 1983 FIPS PUB 112 Password ... of local area network Security 1994 FIPS PUB 196 Entity Authentication Using Public key cryptography Public Key Cryptography 1997 FIPS PUB 197 Advanced Encryption Standard Advanced Encryption Standard ... IEEE P1363 covers most aspects of public key cryptography Transport Layer Security formerly SSL ... Government s cryptography recommendations See also Topics in cryptography Category Cryptography ... more details
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