Image UnionCipherDisk.nsa.jpg 250px thumb The Union American Civil War Union Cipher Disk from the American .... A cipher disk is an encipher ing and decipher ing tool developed in 1470 by the Italian architect and author Leon Battista Alberti . He constructed a device, eponymously called the Alberti cipher ... . ref name dev Deavours, Cipher, et al. Cryptology Machines, History & Methods. Norwood ... method, one could use the much simpler cipher disk. This made both encryption and decryption faster, simpler and less prone to error. Methods of Encryption The cipher disk can be used in one of two ways. The code can be a consistent monoalphabetic substitution for the entire cipher or the disks can be moved periodically throughout the cipher making it polyalphabetic. For a monoalphabetic use, the sender and the person receiving the messages would agree on a key cryptography cipher key setting e.g., the G in the regular alphabet would be positioned next to the Q in the cipher alphabet . The entire message is then encoded according to this key. In addition to simple substitution cipher s, the cipher disk opened the way for convenient polyalphabetic cipher s. An easy way to do this is for the sender ... make it more difficult to crack, using statistical method s. Variations Cipher disks had many small ... hard to crack, the advanced cipher disk would only use combinations of two numbers. Instead of 1 and 2 though, 1 and 8 were used since these numerals look the same upside down as things often are on a cipher .... Cipher disks would also add additional symbols for commonly used combinations of letters like ing ... During the Civil War, military officers were incredibly na ve about how they used cipher disks. Instead .... Problems with Cipher Disks When encoding a message using a cipher disk, a character is always ... much longer for the recipient to read the message. To remedy this, some cipher disks now have multiple characters that stand for end of word. Similarly a cipher disk may also have multiple characters ... more details
Infobox musical artist name Cipher image caption Cipher in 2005. Promo for Children of Gods Fire. Left to RIght Chris Fry, Krys Maniecki, Moe Cipher, Mark Dollar, Danny Cipher image size 250 background ... Cipher is an American hardcore punk , metalcore band that formed in 1996 in Long Beach, New York Long Beach , New York. Cipher s original line up consisted of Moe Mitchell vocals , Danny Bobis drums ... class artist id p413376 pure url yes Cipher Biography . Allmusic. Retrieved April 13, 2008. ref ... in the Long Island Hardcore scene. Another distinct element of Cipher s sound was Moe Ciphers ... to Hip hop. Cipher s music addressed socio political activism, hardcore scene politics and identity ... for Cipher. The four song recording was the first time Cipher put together a compilation of work written ... of the individual in changing her his reality. Cipher has released three demos Serial, 99 cent Demo ... in James Spooner s cult classic documentary Afropunk . In 2005 Cipher released their first non ... . The record is Cipher s attempt at chronicling the internal contradictions and struggles of daily .... Cipher has since been on hiatus pending further detail. Politics Cipher s politics have developed throughout the years. Cipher s early politics were not born out of a coherent ideology. Their earliest ... metaphysical themes. These records provide insights into Cipher s future political leanings ... of straightedge culture and politics. To this day both Danny Cipher and Moe Cipher continue to lead ... original band members were either vegan or vegetarian. To this day Moe Cipher maintains a vegan lifestyle. In 1998 Cipher s music took on a distinctly revolutionary racial consciousness and an explicitly anti racist bent. By 2000 Cipher s politics had become more oppositional in nature and more urgent in its push for dramatic social change . At this point, Cipher s politics had matured to a balanced ... in this period of Cipher s political development was a pronounced gender critique. This enhanced feminist ... more details
No footnotes date April 2011 A polyalphabetic cipher is any cipher based on substitution cipher substitution , using multiple substitution alphabets. The Vigen re cipher is probably the best known example of a polyalphabetic cipher, though it is a simplified special case. The Enigma machine is more complex but still fundamentally a polyalphabetic substitution cipher. History The Alberti cipher by Leon Battista Alberti around 1467 was believed to be the first polyalphabetic cipher. Alberti used a mixed alphabet to encrypt a message, but whenever he wanted to, he would switch to a different alphabet, indicating that he had done so by including an uppercase letter or a number in the cryptogram. For this encipherment Alberti used a decoder device, his cipher disk , which implemented a polyalphabetic substitution with mixed alphabets. Although Alberti is usually considered the father of polyalphabetic cipher, it has been claimed that polyalphabetic ciphers may have been developed by the Arab cryptologist Al Kindi 600 years before Alberti. ref Citation last Maclean first Donald title Al Kindi url http donaldmaclean.wordpress.com 2012 02 20 al kindi accessdate 13 April 2012 ref Johannes Trithemius , in a book published after his death, invented a progressive key polyalphabetic cipher called the Trithemius cipher . Unlike Alberti s cipher, which switched alphabets at random intervals, Trithemius switched alphabets for each letter of the message. He started with a tabula recta , a square .... Alberti s cipher disk implemented the same scheme. It had two alphabets, one on a fixed outer ring ..., and the user rotated the disk by one letter after encrypting each letter. The cipher was trivial to break ... was poorly concealed from attackers. Even Alberti s implementation of his polyalphabetic cipher was rather ... everyone. Polyalphabetic substitution cipher designers seem to have concentrated on obscuring ... navbox classical DEFAULTSORT Polyalphabetic Cipher Category Classical ciphers ar ... more details
A cipher suite is a named combination of authentication , encryption , and message authentication code MAC algorithm s used to negotiate the security settings for a network connection using the Transport Layer Security TLS or Secure Sockets Layer SSL network protocol . The structure and use of the cipher suite concept is defined in the documents that define the protocol RFC 5246 standard for TLS version 1.2 . A reference for named cipher suites is provided in RFC 2434, the TLS Cipher Suite Registry. Use When a TLS connection is established, a handshaking , known as the TLS Handshake Protocol, occurs. Within this handshake, a client hello ClientHello and a server hello ServerHello message is passed. RFC 5246, p. 37 First, the client sends a cipher suite list, a list of the cipher suites that it supports, in order of preference. Then the server replies with the cipher suite that it has selected from the client cipher suite list. RFC 5246, p. 40 In order to test which TLS ciphers that a server supports an SSL TLS Scanner may be used. Detailed description Each named cipher suite defines a key exchange algorithm , a bulk encryption algorithm , a message authentication code MAC algorithm ... aa374757 VS.85 .aspx title Cipher Suites in Schannel publisher Microsoft MSDN accessdate 20 November ... RSA algorithm RSA , Digital Signature Algorithm DSA , Elliptic Curve DSA ECDSA bulk ciphers RC4 cipher ... , Data Encryption Standard DES , or Camellia cipher Camellia . In older versions of SSL, RC2 was also .... Programming references Programatically, a cipher suite is referred to as CipherSuite cipher suites a list of the cryptographic options supported by the client RFC 5246, p. 41 CipherSuite cipher suite the cipher suite selected by the server and revealed in the ServerHello message RFC 5246, p. 42 ... tls parameters.xhtml tls parameters 3 TLS Cipher Suite Registry at http www.iana.org IANA Category ... Secure communication de Cipher Suite ... more details
For the United Kingdom British code word for World War II Germany German stream cipher teleprinter secure communications devices, see Fish cryptography . The FISH FIbonacci SHrinking stream cipher is a fast software based stream cipher using Lagged Fibonacci generator s, plus a concept from the shrinking generator cipher. It was published by Siemens AG Siemens in 1993. FISH is quite fast in software and has a huge key length . However, in the same paper where he proposed Pike cipher Pike , Ross J. Anderson Ross Anderson showed that FISH can be broken with just a few thousand bit s of known plaintext . References citation first1 Uwe last1 Bl cher first2 Markus last2 Dichtl contribution Fish A fast software stream cipher title Proc. Fast Software Encryption 1993 year 1994 series Lecture Notes in Computer Science publisher Springer Verlag volume 809 pages 41 44 doi 10.1007 3 540 58108 1 4 . citation first Ross J. last Anderson contribution On Fibonacci keystream generators title Proc. Fast Software Encryption 1994 year 1995 series Lecture Notes in Computer Science publisher Springer Verlag volume 1008 pages 346 352 doi 10.1007 3 540 60590 8 26 . Cryptography navbox stream Category Stream ciphers Category Fibonacci numbers Crypto stub ... more details
Infobox block cipher name Xenon designers Chang Hyi Lee publish date 2000 derived from derived to related to Zodiac cipher Zodiac key size 128, 192, or 256 bits block size 128 bits structure Feistel cipher Feistel network rounds 16 cryptanalysis In cryptography , Xenon is a block cipher designed in the year 2000 by Chang Hyi Lee for the Korean firm SoftForum. The algorithm uses a key size of 128, 192, or 256 bits. It operates on blocks of 128 bits using a 16 round Feistel cipher Feistel network structure with key whitening . Designed for speed, Xenon s round function doesn t use any substitution box S boxes . The only operations it uses are XOR , addition, multiplication, and bit shifts. References wayback www.softforum.com english download Xenon V1.0.pdf Xenon Technical Material PDF Further reading cite journal title Linear Cryptanalysis of Block Cipher Xenon author Toshio TOKITA and Mitsuru MATSUI journal IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences volume E86 A issue 1 pages 13&ndash 18 date 1 January 2003 Cryptography navbox block Category Broken block ciphers Category Feistel ciphers crypto stub ... more details
Image Vigen re square shading.svg right 250px tabula recta The Trithemius cipher is a polyalphabetic cipher invented by the German author and monk Johannes Trithemius in the 15th century. ref name Salmon Salmon, Data privacy, page 63 ref The cipher was published in his book Polygraphia , which is credited with being the first published work on cryptology . It uses a letter square with the 26 letters of the alphabet following 26 rows of additional letters, each shifted once to the left. This creates 26 different Caesar cipher s. ref name Salmon This method removes the Letter frequency letter frequencies from the ciphertext, making it appear as a random string or block of data. However, if a person is aware that this method is being used, it becomes easy to break. The cipher is vulnerable to attack because it lacks a Key cryptography key , which is said to break Kerckhoffs principle , a rule of cryptology. ref name Salmon Usage Using a tabula recta , each alphabet is shifted one letter to the left from the one above it. This forms 26 rows of shifted alphabets, ending with Z as shown in image . Plaintext Data is encrypted by switching each letter of the message with the letter directly ... called the Vigen re cipher . ref Salomon, Coding for data, page 249 ref Bellaso added a key to switch cipher alphabets every letter. This method was misattributed to Blaise de Vigen re , who published a similar autokey cipher in 1586. Cipher Manuscripts main Cipher Manuscripts Image Folio 13.png frame Example of the cipher used in Folio 13 of the Cipher Manuscripts The Cipher Manuscripts are a collection of 60 folios that were encrypted by using the Trithemius cipher. Contradict inline article Cipher Manuscripts date November 2011 The data that was encrypted were working notes made by someone ... External links http multiver.se tools trithemius Trithemius cipher translator DEFAULTSORT Trithemius Cipher Category Ciphers Category Hermetic Order of the Golden Dawn de Tabula recta es Cifrado ... more details
about the block cipher E2 disambiguation Infobox block cipher name E2 designers Nippon Telegraph and Telephone NTT publish date 1998 derived from derived to Camellia cipher Camellia related to key size 128, 192, or 256 bits block size 128 bits structure Feistel cipher Feistel network rounds 12 cryptanalysis In cryptography , E2 is a block cipher which was created in 1998 by Nippon Telegraph and Telephone NTT and submitted to the AES competition . Like other AES candidates, E2 operates on blocks of 128 bits, using a key of 128, 192, or 256 bits. It uses a 12 round Feistel cipher Feistel network . E2 has an input transformation and output transformation that both use modular arithmetic modular multiplication , but the round function itself consists only of XOR s and substitution box S box lookups. The single 8× 8 bit S box is constructed from the composition of an affine transformation with the discrete exponentiation x sup 127 sup over the finite field GF 2 sup 8 sup . NTT adopted many of E2 s special characteristics in Camellia cipher Camellia , which has essentially replaced E2. References cite conference author Mitsuru Matsui M. Matsui , Toshio Tokita T. Tokita title Cryptanalysis of a Reduced Version of the Block Cipher E2 conference 6th International Workshop on Fast Software Encryption FSE 1999 pages 71&ndash 80 publisher Springer Verlag date March 1999 location Rome url http www.mathmagic.cn Crypt1998 2003 bibs 1636 16360071.htm format PDF accessdate 27 February 2007 Cryptography navbox block Category Feistel ciphers crypto stub ... more details
refimprove date March 2012 Bacon s cipher or the Baconian cipher is a method of steganography a method of hiding a secret message as opposed to a true cipher devised by Francis Bacon . A message is concealed in the presentation of text, rather than its content. Cipher details To encode a message, each letter of the plaintext is replaced by a group of five of the letters A or B . This replacement is done according to the alphabet of the Baconian cipher, shown below. a AAAAA g AABBA n ABBAA t BAABA b AAAAB h AABBB o ABBAB u v BAABB c AAABA i j ABAAA p ABBBA w BABAA d AAABB k ABAAB q ABBBB x BABAB e AABAA l ABABA r BAAAA y BABBA f AABAB m ABABB s BAAAB z BABBB Note A second version of Bacon s cipher uses a unique code for each letter. In other words, I and J each has its own pattern. The writer must make use of two different typeface s for this cipher. After preparing a false message with the same number of letters as all of the As and Bs in the real, secret message, two typefaces are chosen, one to represent As and the other Bs . Then each letter of the false message must be presented in the appropriate typeface, according to whether it stands for an A or a B . ref Helen Fouch Gaines, Cryptanalysis a Study of Ciphers and Their Solutions 1989 , page 6 ref To decode the message, the reverse ... can be used for the Bacon Cipher. Bacon himself prepared a Biliteral Alphabet ref Biliteral can ... seeking to find the real message. Many people still use Bacon s cipher today. Baconian Cipher Example ... to find such messages by looking for the use of Bacon s cipher in early printed editions of the plays ... riddletools bacon.htm Baconian Cipher Tool Purple Hell http www.cs.ucf.edu gworley files baconian cipher.txt Bacon s Cipher Information Examples http w12.easy share.com 976754.html Baconian Cipher Converter Application available for free download Cryptography navbox classical DEFAULTSORT Bacon s Cipher Category Baconian theory of Shakespearean authorship Cipher Category Steganography de Bacon Chiffre ... more details
In cryptography , WG is a stream cipher stream cypher algorithm developed by Guang Gong and Yassir Nawaz . It has been submitted to the eSTREAM Project of the eCRYPT network. Cryptography navbox stream Category Stream ciphers crypto stub ... more details
The Pike stream cipher was invented by Ross J. Anderson Ross Anderson to be a leaner and meaner version of FISH cipher FISH after he broke FISH in 1994 the name is a humorous allusion to the Pike fish Pike fish . The cipher combines ideas from A5 cryptography A5 with the Lagged Fibonacci generator s used in FISH. It is about 10 faster than FISH, yet believed to be much stronger. It potentially has a huge key length , and no attacks have been published As of 2004 lc on . Cryptography navbox stream Category Stream ciphers crypto stub ... more details
Image Pigpen cipher key.svg thumbnail right The pigpen cipher uses graphical symbols assigned according ... cipher sometimes referred to as the masonic cipher , Freemason s cipher , Rosicrucian cipher , or Tic tac toe cipher ref name barker Barker, p. 40 ref ref name wrixon 27 Wrixon, p. 27 ref is a geometric simple substitution cipher which exchanges letters for symbols which are fragments of a grid. The example ... substitution schemes. Due to the simplicity of the cipher, it is often included in children s books on ciphers and secret writing. ref name Gardner Gardner ref History The exact origin of the cipher ... the 18th century. Variations of this cipher were used by both the Rosicrucianism Rosicrucian brotherhood ... used it so often that the system is frequently called the Freemason s cipher. They began using it in the early ... stones in Trinity Church Cemetery in New York City , which opened in 1697, contains a cipher ... one is called the Newark Cipher, which instead of dots uses one to three short lines which ... pigpen message div In popular culture Image Ac2 cipher key.png right thumb Variation of the Freemason cipher used in the computer game Assassin s Creed II The Pigpen cipher has been used in several ... , a 2009 nominee for Lancashire Children s Book of the Year , uses a variation of the Pigpen cipher ... 130&ndash 131 ref In the game Assassin s Creed II , the cipher is used in the hidden glyph puzzle number 10, titled Apollo . Here the cipher is one of many hidden messages tucked away in paintings ... cipher. In Club Penguin, a modified pigpen cipher is used for Secret Agents . Notes reflist References ... Newton, David E. chapter Freemason s Cipher title Encyclopedia of Cryptology year 1998 isbn 0 ... 1998 publisher Black Dog & Leventhal Publishers, Inc. Commons category Pigpen cipher External links http www.ccelian.com ElianScriptFull.html The Elian Script is a similar grid based cipher, used as art. http www.civilwarsignals.org cipher pigpencipher.html Online Pigpen cipher tool for enciphering ... more details
Refimprove date July 2008 A book cipher is a cipher in which the key is some aspect of a book or other ... in the Beale ciphers second Beale cipher , substitutes the first letter of a word in the book with that word s position. In this case, the book cipher is properly a cipher &mdash specifically, a substitution cipher Homophonic substitution homophonic substitution cipher . However, if used often, this technique .... Choosing the Key The main strength of a book cipher is the key. The sender and receiver of encoded messages can agree to use any book or other publication available to both of them as the key to their cipher ... available. In the context of espionage , a book cipher has a considerable advantage for an agent ... s cover story, would seem entirely innocuous. The drawback to a book cipher is that both parties ... which can be used to read the message. Bible Cipher The Bible is a widely available book that is almost ... of a book cipher is just like any other code, but one in which the trouble of preparing and distributing ... the key text. This is, however, not the only way a book cipher may be broken. It is still ... means, without the cryptanalist having any idea what book the cipher is keyed to. ref Yardley ...... A professional could break a book cypher in a matter of hours. If used carefully, the cipher version is probably much stronger, because it acts as a homophonic cipher with an extremely large number ... use of a book cipher is in the Beale ciphers , of which document no. 2 uses a variant printing of the United ... in Japan used a book cipher which the Japanese were unable to cryptanalyze even after capturing both ... as the key text. In the American Revolution , Benedict Arnold used a book cipher, sometimes known as the Arnold Cipher , which used Sir William Blackstone s Commentaries on the Laws of England as a key ... cipher by deducing which book had been used as a key text. The name of Ken Follet s World War II thriller ... s Tales from Shakespeare is used in Our Man in Havana . A book cipher plays an important role in the TV ... more details
Infobox block cipher name Square image caption designers Joan Daemen , Vincent Rijmen publish date 1997 derived from derived to Advanced Encryption Standard AES , CRYPTON , Twofish , Serpent cipher Serpent key size 128 bits block size 128 bits structure substitution permutation network rounds 8 cryptanalysis In cryptography , Square sometimes written S small QUARE small is a block cipher invented by Joan Daemen and Vincent Rijmen . The design, published in 1997, is a forerunner to the Rijndael algorithm, which has been adopted as the Advanced Encryption Standard . Square was introduced together with a new form of cryptanalysis discovered by Lars Knudsen , called the Square attack . The structure of Square is a substitution permutation network with eight rounds, operating on 128 bit blocks and using a 128 bit key cryptography key . Square is not patented. References cite conference author Joan Daemen, Lars Knudsen, Vincent Rijmen title The Block Cipher Square booktitle Fast Software Encryption FSE 1997, Volume 1267 of Lecture Notes in Computer Science pages 149&ndash 165 publisher Springer Verlag date 1997 location Haifa, Israel url http citeseerx.ist.psu.edu viewdoc summary?doi 10.1.1.55.6109 format PDF accessdate 2007 02 15 External links http www.users.zetnet.co.uk hopwood crypto scan cs.html Square SCAN s entry for Square Cryptography navbox block Category Block ciphers crypto stub fr Square cryptographie it Square ru SQUARE simple Square cipher ... more details
Unreferenced date May 2009 In classical cryptography , the bifid cipher is a cipher which combines the Polybius square with transposition cipher transposition , and uses transposition cipher Fractionation fractionation to achieve confusion and diffusion diffusion . It was invented around 1901 by Felix Delastelle . Operation First, a substitution cipher mixed alphabet Polybius square is drawn up 1 2 3 4 5 1 B G W K Z 2 Q P N D S 3 I O A X E 4 F C L U M 5 T H Y V R The message is converted to its Cartesian coordinate system coordinate s in the usual manner, but they are written vertically beneath F L E E A T O N C E 4 4 3 3 3 5 3 2 4 3 1 3 5 5 3 1 2 3 2 5 They are then read out in rows 4 4 3 3 3 5 3 2 4 3 1 3 5 5 3 1 2 3 2 5 Then divided up into pairs again, and the pairs turned back into letters using the square 44 33 35 32 43 13 55 31 23 25 U A E O L W R I N S In this way, each ciphertext character depends on two plaintext characters, so the bifid is a substitution cipher Polygraphic substitution digraphic cipher , like the Playfair cipher . To decrypt, the procedure is simply reversed. Longer messages are first broken up into blocks of fixed length, called the period. Each block is then encrypted separately. Odd periods are slightly more secure than even periods. clarify date January 2012 See also Other ciphers by Delastelle four square cipher related to Playfair trifid cipher similar to bifid External links http rumkin.com tools cipher bifid.php Online Bifid Encipherer Decipherer with polybius square generator Cryptography navbox classical Category Classical ciphers hr Bifidska ifra hu Bifid rejtjel nl Bifidcijfer ro Cifrul bifid ... more details
The D Agapeyeff cipher is an as yet unbroken cipher that appears in the first edition of Codes and Ciphers , an elementary book on cryptography published by the Russian born English cryptographer & cartographer Alexander D Agapeyeff in 1939. Offered as a challenge cipher at the end of the book, it was not included in later editions, and D Agapeyeff is said to have admitted later to having forgotten how he had encrypted it. It has been argued that the failure of all attempts at decryption is due to D Agapeyeff incorrectly encrypting the original text. The ciphertext is blockquote tt 75628 28591 62916 48164 91748 58464 74748 28483 81638 18174 br 74826 26475 83828 49175 74658 37575 75936 36565 81638 17585 br 75756 46282 92857 46382 75748 38165 81848 56485 64858 56382 br 72628 36281 81728 16463 75828 16483 63828 58163 63630 47481 br 91918 46385 84656 48565 62946 26285 91859 17491 72756 46575 br 71658 36264 74818 28462 82649 18193 65626 48484 91838 57491 br 81657 27483 83858 28364 62726 26562 83759 27263 82827 27283 br 82858 47582 81837 28462 82837 58164 75748 58162 92000 br tt blockquote References Shulman, David nom AB STRUSE . The D Agapeyeff Cryptogram A Challenge , http www.cryptogram.org The Cryptogram , April May 1952 39 40, 46. Shulman, David nom AB STRUSE . D Agapeyeff Cipher Postscript , http www.cryptogram.org The Cryptogram , March April 1959 80 81. Barker, Wayne G 1978 . The Unsolved D Agapeyeff Cipher , http www.informaworld.com smpp content db all content a748865321?words d agapeyeff&hash 4013100152 Cryptologia, 2 2 144 147 http elonka.com UnsolvedCodes.html List of famous ... Description of properties and potential decryption strategies for D Agapeyeff cipher by Robert ... challenge 1939.txt Discussion of possible causes of failure to solve D Agapeyeff cipher , at the American Cryptogram Association website http tech.groups.yahoo.com group Dagapeyeff Cipher D Agapeyeff Cipher Yahoo Group D Agapeyeff Cipher Yahoo Group http www.dagapeyeff.com D Agapeyeff Cipher ... more details
Infobox block cipher name Camellia image caption designers Mitsubishi Electric Corporation Mitsubishi , Nippon Telegraph and Telephone NTT publish date 2000 derived from E2 cipher E2 , MISTY1 derived to related ... Feistel network rounds 18 or 24 cryptanalysis In cryptography , Camellia is a 128 bit block cipher ... NTT . The cipher has been approved for use by the ISO ISO IEC , the European Union s NESSIE project and the Japan ese CRYPTREC project. The block ciphercipher has security levels and processing abilities ... Cipher Camellia Approved as a New Standard Encryption Algorithm in the Internet work physorg.com ... key s. The block cipher was designed to be suitable for both software and hardware implementations, from low cost smart cards to high speed network systems. ref cite web title Camellia Cipher Suites ... 08 12 ref Design Camellia is a Feistel cipher with either 18 rounds when using 128 bit keys or 24 ... affine transformations and logical operations. The cipher also uses input and output key whitening ... cipher which can be completely defined by minimal systems of multivariate polynomial s. Vague ... of quadratic equations The entire block cipher can be described by 5104 equations in 2816 variables ... cipher to become part of the OpenSSL Project, under an Open source license , since November 2006 ... Generation International Standard Cipher Camellia Developed in Japan publisher NTT date 2006 ... 07 30 camellia cipher added to firefox title Camellia cipher added to Firefox publisher Mozilla work ... announced that the cipher had also been included in the FreeBSD 6.4 RELEASE. Also, support for the Camellia cipher was added to the disk encryption storage class geli software geli of FreeBSD by Yoshisato .... See also Portal Cryptography Computer science Symmetric cipher References Reflist cite conference author Xin jie ZHAO, Tao WANG, Yuan yuan ZHENG title Cache Timing Attacks on Camellia Block Cipher ... Camellia s English home page http embeddedsw.net Cipher Reference Home.html Reference implementation ... more details
more footnotes date February 2012 Image Hill s message protector fig4 cropped.png thumb Hill s cipher machine, from figure 4 of the patent In classical cryptography , the Hill cipher is a substitution cipher Polygraphic polygraphic substitution cipher based on linear algebra . Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was practical though barely to operate ... is used A 0, B 1, ..., Z 25, but this is not an essential feature of the cipher. A block of n letters ... can also be used. The whole matrix is considered the cipher key cryptography key , and should ... is possible . A Hill cipher is another way of working out the equation of a matrix. Consider the message .... The Hill cipher has achieved Claude Elwood Shannon Shannon s Confusion and diffusion diffusion , and an n dimensional Hill cipher can diffuse fully across n symbols at once. Decryption In order to decrypt ... factors with the modular base, then the matrix cannot be used in the Hill cipher, and another matrix ... the conditions to be used in the Hill cipher are fairly common. For our example key matrix math begin .... Since this has no common factors with 26, this matrix can be used for the Hill cipher. The risk ... number prime . Consequently a useful variant of the Hill cipher adds 3 extra symbols such as a space ... Unfortunately, the basic Hill cipher is vulnerable to a known plaintext attack because it is completely ... not result in a secure cipher it is still a useful step when combined with other non linear operations ... the Hill cipher secure. Key size The key size is the binary logarithm of the number of possible ... math 4.7n 2 math is an upper bound on the key size of the Hill cipher using n × n matrices ... keyspace of a basic Hill cipher is about math 4.64n 2 1.7 math I m not sure how a previous editor found this formula. . For a 5 × 5 Hill cipher, that is about 114 bits. Of course ... at once, a Hill cipher offers no particular advantage over Playfair cipher Playfair or the bifid ... more details
about the block cipher Mercy disambiguation Infobox block cipher name Mercy image caption designers Paul Crowley publish date April 2000 ref name mercy derived from WAKE cipher WAKE derived to key size 128 bits block size 4096 bits structure Feistel network rounds 6 cryptanalysis Scott Fluhrer s differential attack breaks the cipher. ref name fluhrer In cryptography , Mercy is a tweakable block cipher designed by Paul Crowley for disk encryption . The block size cryptography block size is 4096 bits&mdash unusually large for a block cipher, but a standard disk sector size. Mercy uses a 128 bit secret key cryptography key , along with a 128 bit non secret tweak for each block. In disk encryption, the sector number would be used as a tweak. Mercy uses a 6 round Feistel network structure with partial key whitening . The round function uses a key dependent state machine which borrows some structure from the stream cipher WAKE cipher WAKE , with key dependent S box es based on the Kaisa Nyberg Nyberg S boxes also used in Advanced Encryption Standard AES . Scott Fluhrer has discovered a differential attack that works against the full 6 rounds of Mercy. This attack can even be extended to a seven round variant. ref name fluhrer References reflist refs ref name mercy Paul Crowley, http www.ciphergoth.org crypto mercy Mercy A fast large block cipher for disk sector encryption . In Bruce Schneier , editor, Fast Software Encryption 7th International Workshop , volume 1978 of Lecture Notes in Computer Science , pages 49 63, New York , USA, April 2000. Springer Verlag . ref ref name fluhrer cite conference author Scott Fluhrer date 2 April 2006 publisher Cisco Systems, Inc. title Cryptanalysis of the Mercy Block Cipher conference Fast Software Encryption Workshop 2001 location Royal Park Hotel Nikko, Yokohama, Japan url http www.ciphergoth.org crypto mercy fluhrer dc.html format PostScript accessdate 15 December 2006 ref Cryptography navbox block Category Broken block ciphers Category ... more details
Infobox block cipher name KN Cipher designers Kaisa Nyberg and Lars Knudsen publish date 1995 derived from derived to related to certification key size 198 bits block size 64 bits structure Feistel cipher Feistel network rounds 6 cryptanalysis Jakobsen & Knudsen s higher order differential cryptanalysis breaks KN Cipher with only 512 chosen plaintexts and 2 sup 41 sup running time, or with 32 chosen plaintexts and 2 sup 70 sup running time. ref name interp In cryptography , KN Cipher is a block cipher created by Kaisa Nyberg and Lars Knudsen in 1995. One of the first ciphers designed to be provable security provably secure against ordinary differential cryptanalysis , KN Cipher was later broken using higher order differential cryptanalysis . Presented as a prototype...compatible with Data Encryption Standard DES , the algorithm has a 64 bit block size cryptography block size and a 6 round Feistel cipher Feistel network structure. The round function is based on the cube arithmetic cube operation in the finite field GF 2 sup 33 sup . The designers did not specify any key schedule for the cipher they state, All round keys should be independent, therefore we need at least 198 key bits. ref name kn Cryptanalysis Jakobsen & Knudsen s higher order differential cryptanalysis breaks KN Cipher with only 512 chosen plaintexts and 2 sup 41 sup running time, or with 32 chosen plaintexts and 2 sup 70 sup running time. ref name interp References reflist refs ref name kn cite journal author K. Nyberg, L.R. Knudsen title Provable Security Against a Differential Attack journal Journal of Cryptology volume 8 issue 1 issn 0933 2790 pages 27&ndash 37 year 1995 url http citeseer.ist.psu.edu nyberg95provable.html format PDF PostScript accessdate 23 January 2007 ref ref name interp cite conference author Thomas Jakobsen T. Jakobsen , L.R. Knudsen title The Interpolation Attack on Block Ciphers conference 4th International Workshop on Fast Software Encryption FSE 97 pages 28&ndash 40 publisher ... more details
Refimprove date March 2009 In cryptography , a substitution cipher is a method of encryption by which ... be compared with transposition cipher s. In a transposition cipher, the units of the plaintext are rearranged .... By contrast, in a substitution cipher, the units of the plaintext are retained in the same sequence ... of substitution cipher. If the cipher operates on single letters, it is termed a simple substitution cipher a cipher that operates on larger groups of letters is termed polygraphic . A monoalphabetic cipher uses fixed substitution over the entire message, whereas a polyalphabetic cipher uses a number ... thumb 300px right ROT13 is a Caesar cipher , a type of substitution cipher. In ROT13, the alphabet ... alphabet . The cipher alphabet may be shifted or reversed creating the Caesar cipher Caesar ... alphabet is sometimes different from the plaintext alphabet for example, in the pigpen cipher ... a mixed alphabet is to perform a transposition cipher Columnar transposition columnar transposition ... key cryptography key s is very large 26 2 sup 88.4 sup , or about key size 88 bits , this cipher ... substitution cipher . See WP MOS Section management Image Babington postscript.jpg thumbnail ... who announced the titles of visiting dignitaries, this cipher combined a small codebook with large ... of important people, hence the name of the cipher in later years it covered many common words and place names as well. The symbols for whole words codeword s in modern parlance and letters cipher in modern parlance were not distinguished in the ciphertext. The Rossignols Great Cipher used by Louis ... of history historical research . The Beale Ciphers are another example of a homophonic cipher. This is a fascinating ... character. Another homophonic cipher was described by Stahl ref Stahl, Fred A., On Computational ... 3AAddress 3A 67.188.203.8 2C 5B172.16.161.5 2C 67.188.203.8 2C 127.0.0.1 5D 20 A homophonic cipher for computational ... of digits, he constructed the cipher in such a way that the number of homophones for a given character ... more details
Image Vigenere.jpg right thumbnail The Vigen re cipher is named for Blaise de Vigen re pictured , although Giovan Battista Bellaso had invented the cipher earlier. Vigen re did invent a stronger autokey cipher . File Confederate cipher disk.png right thumb A reproduction of the Confederacy s cipher disk on display at the National Cryptologic Museum The Vigen re cipher is a method of encryption encrypting alphabet ic text by using a series of different Caesar cipher s based on the letters of a keyword. It is a simple form of Polyalphabetic cipher polyalphabetic substitution . ref cite book authors ... http books.google.com books?id 1NHli2uzt EC&pg PT142 ref The Vigen re IPA fr vi n cipher has been ... de Vigen re in the 19th century, and is now widely known as the Vigen re cipher . cn date April 2012 This cipher is well known because while it is easy to understand and implement, it often appears ... cipher . Consequently, many people have tried to implement encryption schemes that are essentially ... The first well documented description of a polyalphabetic cipher was formulated by Leon Battista Alberti around 1467 and used a metal cipher disc to switch between cipher alphabets. Alberti s system ... , invented the tabula recta , a critical component of the Vigen re cipher. The Trithemius cipher , however, only provided a progressive, rigid and predictable system for switching between cipher alphabets. cn date April 2012 What is now known as the Vigen re cipher was originally described ... cipher alphabets every letter. Whereas Alberti and Trithemius used a fixed pattern of substitutions ... his description of a similar but stronger autokey cipher before the court of Henry III of France , in 1586. Later, in the 19th century, the invention of Bellaso s cipher was misattributed to Vigen re ... this important contribution and instead named a regressive and elementary cipher for him Vigen re ... & Schuster isbn 0684831309 ref The Vigen re cipher gained a reputation for being exceptionally strong ... more details
stream cipher used to encrypt mobile phone conversations. In cryptography , a stream cipher is a symmetric key algorithm symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream keystream . In a stream cipher each plaintext numerical digit digit is encrypted .... An alternative name is a state cipher , as the encryption of each digit is dependent on the current .... Stream ciphers represent a different approach to symmetric encryption from block cipher s. Block ... is not always clear cut in some block cipher modes of operation modes of operation , a block cipher primitive is used in such a way that it acts effectively as a stream cipher. Stream ciphers typically ... ciphers can be susceptible to serious security problems if used incorrectly see stream cipher attack ... time pad Stream ciphers can be viewed as approximating the action of a proven unbreakable cipher, the one time pad OTP , sometimes known as the Vernam cipher . A one time pad uses a keystream of completely ... has not been widely used, except for the most critical applications. A stream cipher makes use of a much ... cipher to be completely insecure. Types of stream ciphers A stream cipher generates successive ... ways if the state changes independently of the plaintext or ciphertext messages, the cipher is classified as a synchronous stream cipher. By contrast, self synchronising stream ciphers update their state based on previous ciphertext digits. Synchronous stream ciphers In a synchronous stream cipher a stream ... or operation XOR . This is termed a binary additive stream cipher . In a synchronous stream cipher ... cipher is a block cipher in cipher feedback CFB block cipher modes of operation mode . Linear feedback ... used stream cipher designs. Instead of a linear driving device, one may use a nonlinear update ... on n bit words. Expand section date June 2008 Security Main article Stream cipher attack For a stream cipher to be secure, its keystream must have a large periodic function period and it must be impossible ... more details
Infobox Album Name Cloak and Cipher Type Album Artist Land of Talk Cover Alt Released August 24, 2010 Recorded Genre Indie rock Length 48 54 Label Saddle Creek Records Producer Reviews Last album Some Are Lakes br 2005 This album Cloak and Cipher br 2008 Next album Misc Cloak and Cipher is the second full length album by Canada Canadian indie rock band Land of Talk , released August 24, 2010, on Saddle Creek Records . The album features special guests including Patrick Watson musician Patrick Watson as well as members of Stars Canadian band Stars , Thee Silver Mt. Zion , Wintersleep , The Besnard Lakes , Arcade Fire and Esmerine . ref http music.is amazing.com 2010 08 12 land talk cloak and cipher 2010 Land of Talk Cloak an Cipher 2010 . Music Is Amazing , August 12, 2010. ref The album was named as a longlisted nominee for the 2011 Polaris Music Prize . ref name longlist http www.aux.tv 2011 06 2011 polaris music prize long list announced 2011 Polaris Music Prize Long List announced . Aux TV channel aux.tv , June 16, 2011. ref Track listing Tracklist title1 Cloak and Cipher length1 3 48 title2 Goaltime Exposure length2 5 43 title3 Quarry Hymns length3 5 46 title4 Swift Coin length4 4 51 title5 Color Me Badd length5 3 59 title6 The Hate I Won t Commit length6 5 01 title7 Hamburg, Noon length7 3 33 title8 Blangee Blee length8 4 08 title9 Playita length9 5 57 title10 Better and Closer length10 6 13 References reflist DEFAULTSORT Cloak and Cipher Category 2010 albums Category Land of Talk albums Category Saddle Creek Records albums ... more details
Infobox Album Name Cipher Type Studio album Artist The Alpha Conspiracy Cover Alpha conspiracy cipher.jpg Background Studio Released 2001 Recorded Genre Intelligent dance music IDM Length 46 22 Label Diffusion Records Producer The Alpha Conspiracy Reviews Last album This album Cipher br 2001 Next album Aura The Alpha Conspiracy album Aura br 2004 Cipher is the debut album by The Alpha Conspiracy , released in 2001. Splendid E Zine s Ron Davies called the album easily one of the best electronic releases of the past year , and later wrote, Whereas a great deal of electronic music is best described as icy and repetitive, Sega s compositions are completely engaging. ref name Ezine cite web url http www.splendidezine.com reviews may 7 01 alpha.html title Cipher review publisher Splendid E zine accessdate September 27, 2011 author Davies, Ron ref Track listing tracklist total length 46 22 all writing Andrew Sega title1 Cross Product length1 5 12 title2 Martian Love Song length2 4 13 title3 Black Sunrise length3 4 53 title4 Winter length4 4 01 title5 Skeptopotamus length5 3 17 title6 Glass length6 2 35 title7 Ubik length7 4 23 title8 Morphic length8 4 08 title9 Nonsense length9 4 02 title10 Spiral Effect length10 5 91 title11 Further length11 4 37 References reflist External links http www.splendidezine.com reviews may 7 01 alpha.html Cipher review at Splendid E zine http www.allmusic.com cg amg.dll?p amg&sql 10 hbfwxqwsldse Cipher at Allmusic Category 2001 debut albums Category Intelligent dance music albums Category Electronica albums ... more details
Encyclopedia
top
