streamcipher used to encrypt mobile phone conversations. In cryptography , a streamcipher is a symmetric ... cipher bit stream keystream , typically by an exclusive or xor operation. In a streamcipher the plaintext ... s. Stream ciphers represent a different approach to symmetric encryption from block cipher s. Block ... primitive is used in such a way that it acts effectively as a streamcipher. Stream ciphers typically ... can be susceptible to serious security problems if used incorrectly see streamcipher attack ... pad Stream ciphers can be viewed as approximating the action of a proven unbreakable cipher, the one ... not been widely used, except for the most critical applications. A streamcipher makes use of a much ... cipher to be completely insecure. Types of stream ciphers A streamcipher generates successive elements ... as a synchronous streamcipher. By contrast, self synchronising stream ciphers update their state based on previous ciphertext digits. Synchronous stream ciphers In a synchronous streamcipher a stream ... XOR . This is termed a binary additive streamcipher . In a synchronous streamcipher, the sender ..., affecting only up to N plaintext digits. An example of a self synchronising streamcipher ... RC4 is one of the most widely used streamcipher designs. Instead of a linear driving device, one may ... cipher attack For a streamcipher to be secure, its keystream must have a large periodic function ... . As with other attacks in cryptography, streamcipher attacks can be certificational , meaning ... other weaknesses. Securely using a secure synchronous streamcipher requires that one never reuse the same ... of the cipher. Application designers must also recognize that most stream ciphers don t provide ... an hour. Some applications using the streamcipher RC4 are attackable because of weaknesses in RC4 ... in a streamcipher mode were to be used in this type of application, the designer would need to choose ... is that the cipherstream can be generated in a separate box that is subject to strict security ... more details
unreferenced date April 2010 In cryptography , ABC is a streamcipherstream cypher algorithm developed by Vladimir Anashin , Andrey Bogdanov , Ilya Kizhvatov , and Sandeep Kumar . It has been submitted to the eSTREAM Project of the eCRYPT network. Crypto navbox stream DEFAULTSORT Abc Category Stream ciphers crypto stub ... more details
Unreferenced date February 2008 Streamcipher s, where plaintext bits are combined with a cipher bit stream by an exclusive or operation xor , can be very secure if used properly. However they are vulnerable to attack if certain precautions are not followed keys must never be used twice valid encryption should never be relied on to indicate authenticity Reused key attack Streamcipher s are vulnerable to attack if the same key is used twice depth of two or more. Say we send messages A and B of the same length, both encrypted using same key, K . The streamcipher produces a string of bits C K the same length as the messages. The encrypted versions of the messages then are E A A xor C E B B xor C where xor is performed bit by bit. Say an adversary has intercepted E A and E B . He can easily compute E A xor E B However xor is commutative and has the property that X xor X 0 self inverse so E A xor E B A xor C xor B xor C A xor B xor C xor C A xor B If one message is longer than the other our adversary just truncates the longer message to the size of the shorter and his attack will only reveal that portion of the longer message. In other words, if anyone intercepts two messages encrypted with the same key, they can recover A xor B , which is a form of running key cipher . Even if neither message is known, as long as both messages are in a natural language, such a cipher can often be broken by paper and pencil methods. John Tiltman accomplished this with the Lorenz cipher TUNNY in World War II . With an average personal computer , such ciphers can usually be broken in a matter of minutes ... is if traffic flow security measures have each stations sending a continuous stream of cipher bits ... a one time key for the streamcipher. This is done in several common systems that use the popular streamcipher RC4 , including Wired Equivalent Privacy WEP , Wi Fi Protected Access WPA and Ciphersaber ... of the ciphertext with the string 1000.00 xor 9500.00 . To see how this works, consider that the cipher ... more details
Other uses Refimprove date October 2010 pp move indef Wiktionary stream Image Butchers creek omeo13.jpg thumb 250px Butchers Creek, Omeo, Victoria , Australia . A stream is a body of water with a Current stream current , confined within a stream bed bed and Bank geography stream bank s. Depending on its locale or certain characteristics, a stream may be referred to as a branch , brook , beck , Burn topography burn , creek , crick, gill occasionally ghyll , Kill body of water kill , lick stream lick ... migration. The biological habitat in the immediate vicinity of a stream is called a riparian ... Image Hawaii Creek.jpg thumb A rocky stream in Hawaii , United States File Arkhangelskaia oblast Plesetskiy ... Ambro torrent, Italy . River A large natural stream, which may be a waterway . Creek In North America , Australia and New Zealand , a small to medium sized natural stream. Sometimes navigable by motor ... Island from the mainland . In these cases, the stream is the tidal stream, the course of the seawater through the creek tidal creek channel at low and high tide. Tributary A contributory stream, or a stream ... a branch or fork. Brook A stream smaller than a creek , especially one that is fed by a spring hydrosphere ... is characterized by its shallowness and its stream bed bed being composed primarily of rocks. Other names In the United Kingdom , there are several regional names for a stream Beck is used in Yorkshire ... in Wales . Stream is used in Southern England . Syke is used in lowland Scotland and Cumbria. Allt ..., Maryland , or Virginia can be the name of a stream. Branch , fork , or prong can refer to tributaries or distributaries that share the same name as the main stream, generally with the addition of a cardinal ... rivers named in this manner, unique to Maryland. Stream and brook are used in Midwestern United ... States. Parts of a stream Bar A Bar landform shoal that develops at the mouth of a river as sediment ... a stream emerges from an underground course through unconsolidated sediment s or through caves. A stream ... more details
In cryptography , WG is a streamcipherstream cypher algorithm developed by Guang Gong and Yassir Nawaz . It has been submitted to the eSTREAM Project of the eCRYPT network. crypto stub Crypto navbox stream Category Stream ciphers ... more details
The Scream cipher is a word based streamcipher developed by Shai Halevi , Don Coppersmith and Charanjit Jutla from IBM . The cipher is designed as a software efficient streamcipher. The authors describe the goal of the cipher to be a more secure version of the SEAL cipher SEAL cipher. The general design of Scream is close to the design of SEAL with block cipher like round functions. There are two versions of Scream. One of them, Scream F , reuses the S box es from the Advanced Encryption Standard AES block cipher, while the other, Scream , internally generates new, key dependent S boxes as part of the initialization phase. The round function is also based on the AES round function, but is narrower, 64 bits instead of 128 bits. The cipher uses a 128 bit key and a 128 bit nonce. It is efficient in software, running at 4 5 cycles per byte on modern processors. The cipher was presented at the Fast Software Encryption FSE conference in 2002. References http eprint.iacr.org 2002 019.pdf Scream a software efficient streamcipher pdf Crypto navbox stream Category Stream ciphers crypto stub ... more details
Dragon is a streamcipher developed at the Information Security Institute by Ed Dawson, Kevin Chen, Matt Henricksen, William Millan, Leonie Simpson, HoonJae Lee, and SangJae Moon. The cipher is a Phase 3 Focus candidate for the eSTREAM project. The cipher is targeted for fast software implementations and versions with different key lengths exists. The version selected for Phase 3 is Dragon 128. It is not patented. Dragon has not been successfully attacked to date, but Cho and Pieprzyk found biases within the primary non linear component of the cipher http www.ecrypt.eu.org stream papersdir 2007 002.pdf . This suggests that the security of the cipher is weaker than intended by its designers. External links http www.ecrypt.eu.org stream dragon.html eSTREAM page on Dragon crypto stub Crypto navbox stream Category Stream ciphers ... more details
In cryptography , NLS is a streamcipherstream cypher algorithm designed by Gregory Rose , Philip Hawkes , MIchael Paddon , and Miriam Wiggers de Vries . It has been submitted to the eSTREAM Project of the eCRYPT network. crypto stub Crypto navbox stream Category Stream ciphers ... more details
In cryptography , WAKE is a streamcipher designed by David Wheeler computer scientist David Wheeler in 1993. WAKE stands for Word Auto Key Encryption . The cipher works in cipher feedback Block cipher modes of operation mode , generating keystream blocks from previous ciphertext blocks. WAKE uses an S box with 256 entries of 32 bit words. The cipher is fast, but vulnerable to chosen plaintext attack chosen plaintext and chosen ciphertext attack s. ref Bruce Schneier, Applied Cryptography , Second Edition, page 402. ref See also Tiny Encryption Algorithm TEA , XTEA References references External links http www.cix.co.uk klockstone wake.htm A Bulk Data Encryption Algorithm Crypto navbox stream Category Stream ciphers crypto stub ru WAKE ... more details
For the United Kingdom British code word for World War II Germany German streamcipher teleprinter secure communications devices, see Fish cryptography . The FISH FIbonacci SHrinking streamcipher is a fast software based streamcipher 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 streamcipher 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 . Category Stream ciphers Category Fibonacci numbers Crypto stub Crypto navbox stream ... more details
The Pike streamcipher 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 . crypto stub Crypto navbox stream Category Stream ciphers ... more details
In cryptography , Frogbit is a streamcipherstream cypher algorithm developed by Thierry Moreau and is patent ed. It includes a message authentication code feature. It has been submitted to the eSTREAM Project of the eCRYPT network. It has not been selected as a focus algorithm nor for Phase 2 it has been archived . crypto stub Crypto navbox stream Category Stream ciphers ... more details
In cryptography , SSS is a streamcipherstream cypher algorithm developed by Gregory Rose , Philip Hawkes , Michael Paddon , and Miriam Wiggers de Vries . It includes a message authentication code feature. It has been submitted to the eSTREAM Project of the eCRYPT network. It has not selected for focus nor for consideration during Phase 2 it has been archived . crypto stub Crypto navbox hash stream Category Stream ciphers Category Message authentication codes ... more details
Turing is a streamcipher developed by Gregory G. Rose and Philip Hawkes at Qualcomm for CDMA . It is designed to be fast in software and achieves around 5.5 cycles byte on some x86 processors. Turing generates 160 bits of output in each round by applying a non linear filter to the internal state of an LFSR . See also SOBER 128 Helix cipher Helix External links http www.qualcomm.com.au news releases 2003 press1161.html Turing article at Qualcomm http www.jdudar.com turing index.html Java Implementation of Turing Algorithm References Gregory G. Rose and Philip Hawkes , Turing A Fast StreamCipher, Fast Software Encryption 2003, pp290&ndash 306 http www.qualcomm.com.au PublicationsDocs Turing.pdf PDF . Antoine Joux and Fr d ric Muller, A Chosen IV Attack Against Turing, Selected Areas in Cryptography 2003, pp194&ndash 207. crypto stub Category Stream ciphers ... 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 ... algorithm is used to encrypt the message stream. It also includes the key size and the lengths ... of each Block telecommunications block of the message stream. RFC 5246, p. 17 The pseudorandom function ... aa374757 VS.85 .aspx title Cipher Suites in Schannel publisher Microsoft MSDN accessdate 20 November ... Signature Algorithm DSA , Elliptic Curve DSA ECDSA bulk ciphers RC4 cipher RC4 , Triple DES , Advanced ... DES , or Camellia cipher Camellia . In older versions of SSL, RC2 was also used. message authentication ..., 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 ... tls parameters 3 TLS Cipher Suite Registry at http www.iana.org IANA Category Application layer protocols ... more details
LEX is a streamcipher based on the round transformation of Advanced Encryption Standard AES . LEX provides the same key agility and short message block performance as AES while handling longer messages faster than AES. In addition, it has the same hardware and software flexibility as AES, and hardware implementations of LEX can share resources with AES implementations. Designed by Alex Biryukov , LEX is a Phase 2 Focus candidate for the eSTREAM project. It is not patented. A new revision of LEX protects against a slide attack found in an earlier version. External links http www.ecrypt.eu.org stream lex.html eSTREAM page on LEX crypto stub Crypto navbox stream Category Stream ciphers ... more details
Rabbit is a high speed streamcipher first presented ref M. Boesgaard, M. Vesterager, T. Pedersen, J. Christiansen, O. Scavenius. Rabbit A High Performance StreamCipher. Proc. FSE 2003. Springer LNCS 2887, pp. 307 329 http www.cryptico.com Files filer rabbit fse.pdf PDF ref in February 2003 at the 10th FSE workshop. In May 2005, it was submitted to the eSTREAM project of the ECRYPT network. Rabbit was designed by Martin Boesgaard , Mette Vesterager , Thomas Pedersen CS Thomas Pedersen , Jesper Christiansen CS Jesper Christiansen and Ove Scavenius . Rabbit uses a 128 bit key and a 64 bit initialization vector. The cipher was designed with high performance in software in mind, where fully optimized implementations achieve an encryption speed of up to 3.7 Cycles per byte CPB on a Pentium 3, and of 9.7 Cycles per byte CPB on an ARM7. However, the cipher also turns out to be very fast and compact in hardware. The core component of the cipher is a bitstream generator which encrypts 128 message bits per iteration. The cipher s strength rests on a strong mixing of its inner state between two consecutive iterations. The mixing function is entirely based on arithmetical operations that are available ... the cipher. The authors of the cipher have provided a full set of cryptanalytic white papers on the Cryptico home page ref M. Boesgaard, T. Pedersen, M. Vesterager, E. Zenner. The Rabbit StreamCipher Design and Security Analysis. Proc. SASC 2004. http www.cryptico.com files filer rabbit sasc ... and for many years required a license fee for commercial use of the cipher which was waived for non ... www.ecrypt.eu.org stream phorum read.php?1,1244 ref Security Rabbit claims 128 bit security against ... www.ecrypt.eu.org stream papersdir 040.pdf PDF ref . A small bias in the output of Rabbit exists ref Jean Philippe Aumasson, On a bias of Rabbit , Proc. SASC 2007. http www.ecrypt.eu.org stream papersdir ... stream rabbitp2.html eSTREAM page on Rabbit Crypto navbox stream Category Stream ciphers ... more details
repeats , the XOR cipher is more secure. When the keystream is generated by a pseudo random number generator , the result is a streamcipher . With a key that is Hardware random number generator truly ... key . See also Vernam cipher Vigen re cipher External links https chris.dod.net xor xor.php Solving the Basic XOR Cipher Category Stream ciphers es Cifrado XOR sl XOR ifriranje uk XOR zh ...Unreferenced date July 2009 In cryptography , the simple XOR cipher is a simple encryption algorithm that operates according to the principles A math oplus math 0 A, A math oplus math A 0, A math oplus math B math oplus math C A math oplus math B math oplus math C , B math oplus math A math oplus math A B math oplus math 0 B, where math oplus math denotes the exclusive disjunction XOR operation. With this logic, a string of text can be encrypted by applying the bitwise XOR operator to every character using a given key. To decrypt the output, merely reapplying the key will remove the cipher. For example, the string Wiki 01010111 01101001 01101011 01101001 in 8 bit ASCII can be encrypted with the key 11110011 as follows tt 01010111 01101001 01101011 01101001 tt math oplus math tt 11110011 11110011 11110011 11110011 tt style border top 1px solid black tt 10100100 10011010 10011000 10011010 tt And conversely, for decryption tt 10100100 10011010 10011000 10011010 tt math oplus math tt 11110011 11110011 11110011 11110011 tt style border top 1px solid black tt 01010111 01101001 01101011 01101001 tt The XOR operator is extremely common as a component in more complex ciphers. By itself, using a constant repeating key, a simple XOR cipher can trivially be broken using frequency analysis . If the content of any message can be guessed or otherwise known then the key can be revealed. Its primary merit is that it is simple to implement, and that the XOR operation is computationally inexpensive. A simple repeating XOR cipher is therefore sometimes used for hiding information in cases where ... more details
Image Leviathan cipher.png right 300px thumb LEVIATHAN s tree based keystream generation LEVIATHAN is a streamcipher submitted to NESSIE by Scott Fluhrer and David McGrew . It is a seekable streamcipher, which means that the user may efficiently skip forward to any part of the keystream , much like Block cipher modes of operation CTR mode or Salsa20 , but unlike those ciphers generating contiguous blocks of the keystream is made especially efficient by LEVIATHAN s unique tree structure based stream generation. LEVIATHAN achieves around 11 cycles per byte on a Pentium II processor. LEVIATHAN is considered broken due to distinguishing attacks which require 2 sup 36 sup bytes of output and comparable effort. ref cite conference first P. last Crowley authorlink Paul Crowley cryptographer coauthors Stefan Lucks Lucks, S. title Bias in the LEVIATHAN streamcipher booktitle Fast Software Encryption 8th International Workshop Lecture Notes in Computer Science publisher Springer Verlag date April 2001 location Yokohama, Japan url http www.ciphergoth.org crypto leviathan accessdate 2006 11 13 ref External links http www.cosic.esat.kuleuven.ac.be nessie workshop submissions leviathan.zip LEVIATHAN specification ZIP file format ZIP file &mdash link dead. http web.archive.org web http www.cosic.esat.kuleuven.ac.be nessie workshop submissions leviathan.zip Available from the Internet Archive References references crypto stub Crypto navbox stream Category Stream ciphers fr Leviathan cryptographie ... more details
about the block cipher Mercy disambiguation Infobox block cipher name Mercy image caption designers Paul Crowley publish date April 2000 ref 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 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 mercy 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 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 streamcipher 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 mercy References references crypto stub Crypto navbox block Category Broken block ciphers Category Feistel ciphers ... more details
References references See also Cryptography Streamcipher Substitution permutation network Lifting ...In cryptography , a Feistel cipher is a symmetric structure used in the construction of block cipher ... of block cipher s use the scheme, including the Data Encryption Standard DES . The Feistel structure ... required to implement such a cipher is nearly halved. A Feistel network is an iterated cipher with an internal ... Feistel networks were first seen commercially in IBM s Lucifer cipher Lucifer cipher, designed by Horst ... adopted the Data Encryption Standard DES a cipher based on Lucifer, with changes made by the National ... are based on Feistel networks e.g. GOST 28147 89 block cipher , and the structure and properties ... and Charles Rackoff analyzed the Feistel cipher construction, and proved that if the round function ... is sufficient to make the block cipher a pseudorandom permutation , while 4 rounds is sufficient ... Construction details File Feistel cipher diagram.png right Let math rm F math be the round function ... between encryption and decryption. Unbalanced Feistel cipher Unbalanced Feistel ciphers use a modified ... paper unbalanced feistel.html ref The Skipjack encryption algorithm is an example of such a cipher. The Texas Instruments Digital Signature Transponder uses a proprietary unbalanced Feistel cipher ... bono bono.pdf pdf ref The Thorp shuffle is an extreme case of an unbalanced Feistel cipher in which one side is a single bit. This has better provable security than a balanced Feistel cipher but requires ... Encryption . Feistel networks as a design component Whether the entire cipher is a Feistel cipher or not, Feistel like networks can be used as a component of a cipher s design. For example, MISTY1 is a Feistel cipher using a three round Feistel network in its round function, Skipjack cipher Skipjack is a modified Feistel cipher using a Feistel network in its G permutation, and Threefish part of Skein hash function Skein is a non Feistel block cipher that uses a Feistel like MIX function. List ... more details
them the right way. Streamcipher s can be built using block ciphers. OFB mode and CTR mode are Block cipher modes of operation block modes that turn a block cipher into a streamcipher. Cryptographic ...Refimprove date March 2009 No footnotes date March 2009 In cryptography , a block cipher is a symmetric key algorithm symmetric key cipher operating on fixed length groups of bit s, called Block telecommunications block s, with an unvarying transformation. A block cipher encryption algorithm might take ... with a block cipher by breaking the message into blocks and encrypting each block individually ..., block cipher modes of operation modes of operation are used to make encryption probabilistic. Some modes of operation, despite the fact that their underlying implementation is a block cipher, allow the encryption of individual bits. The resulting cipher is called a streamcipher . An early and highly influential block cipher design was the Data Encryption Standard DES , developed at IBM and published ... in 2001. Generalities A block cipher consists of two paired algorithms, one for encryption, E , and the other ... of several block cipher modes of operation modes of operation is generally used along with a padding ... a simpler function. This approach is known as iterated block cipher see also product cipher . Each ... , S box es and various permutation s are all frequently used as components. History Lucifer cipher Lucifer is generally considered to be the first civilian block cipher, developed at IBM in the 1970s ... community and it inspired many new cipher designs. DES has a block size of 64 bits and a key size of 56 bits. 64 bit blocks became common in block cipher designs after DES. Key cryptography Key length ... . The cipher was developed by two Demographics of Belgium Belgian cryptographers, Joan Daemen and Vincent ... attack , impossible differential cryptanalysis and algebraic attacks. For a new block cipher ... a generalized version of block ciphers called tweakable block ciphers. A tweakable block cipher accepts ... more details
Grain is a streamcipher submitted to eSTREAM in 2004 by Martin Hell , Thomas Johansson cryptographer ... Johansson , Willi Meier title Grain A StreamCipher for Constrained Environments publisher eSTREAM date 2005 04 29 url http www.ecrypt.eu.org stream ciphers grain grain.pdf format PDF ref the authors ... Thomas Johansson , Willi Meier title Grain A StreamCipher for Constrained Environments publisher eSTREAM year 2006 url http www.ecrypt.eu.org stream p2ciphers grain Grain p2.pdf format PDF ref the cipher has a slightly revised output function and the NLFSR feedback function received a minor ... of the streamcipher Grain 1.0. For any K,IV pair there exist related K ,IV pair with probability 1 ... on Grain Crypto navbox stream DEFAULTSORT Grain Cipher Category Stream ciphers ... a maximum length of output per key, iv pair. A number of potential weaknesses in the cipher have ... bit LFSR is updated with a 6 to 1 linear function. During keying operations the output of the cipher ... and released as output. To initialize the cipher, the 80 bit key is loaded directly into the 80 bits ... of the LFSR are filled with ones. The cipher is sealed for 160 rounds where the 160 bits of keystream generated are fed back linearly into both the LFSR and NLFSR update functions. The cipher releases ... 160 clockings. Performance The cipher is designed to allow up to 16 rounds to be carried out in parallel ... bits and the IV size is specified to be 64 bits. The authors claim that the cipher is designed such that no attack ... in hardware applications. Well known examples of such ciphers are E0 cipher E0 used in Bluetooth and A5 ... proven to be very insecure. Compared to E0 cipher E0 and A5 1 , Grain provides higher security while maintaining a small hardware complexity. The authors quote the attack against E0 cipher E0 ref cite ... Grain Version 0.0 cipher was broken by a key recovery attack ref cite paper author C me Berbain ... url http www.ecrypt.eu.org stream papersdir 2006 019.pdf format PDF ref which required a complexity ... more details
In cryptography , SEAL Software Optimized Encryption Algorithm is a very fast streamcipher optimised for machines with a 32 bit word size and plenty of Random Access Memory RAM . SEAL is actually a pseudorandom function family in that it can easily generate arbitrary portions of the keystream without having to start from the beginning. This makes it particularly well suited for applications like encrypting hard drives. The first version was published by Phillip Rogaway and Don Coppersmith in 1994. The current version, published in 1997, is 3.0. SEAL is covered by two patents in the United States, both of which are assigned to IBM . References US patent 5454039 Software efficient pseudorandom function and the use thereof for encryption US patent 5675652 Computer readable device implementing a software efficient pseudorandom function encryption crypto stub Crypto navbox stream Category Stream ciphers de SEAL Algorithmus ru SEAL ... more details
navbox classical DEFAULTSORT Vigenere Cipher Category Classical ciphers Category Stream ciphers ca ...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 . 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 . The Vigen re IPA fr vi n cipher has been reinvented many ... century, and is now widely known as the Vigen re cipher . This cipher is well known because ... it the description le chiffre ind chiffrable French for the indecipherable cipher . Consequently ... 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 only switched alphabets after several ... , a critical component of the Vigen re cipher. Trithemius, however, only provided a progressive, rigid and predictable system for switching between cipher alphabets. This was known as the Trithemius cipher . What is now known as the Vigen re cipher was originally described by Giovan Battista Bellaso ..., but added a repeating countersign a Key cryptography key to switch cipher alphabets every letter. Blaise de Vigen re published his description of a similar but stronger autokey cipher before ... s cipher was misattributed to Vigen re. David Kahn in his book The Codebreakers lamented the misattribution ... and elementary cipher for him Vigen re though he had nothing to do with it . ref name KahnOrigin cite ... On the Origin of a Species publisher Simon & Schuster isbn 0684831309 ref The Vigen re cipher gained ... Lewis Carroll called the Vigen re cipher unbreakable in his 1868 piece The Alphabet Cipher in a children s magazine. In 1917, Scientific American described the Vigen re cipher as impossible of translation ... more details
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