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	RC6 - Wikipedia, the free encyclopedia
		In cryptography, RC6 is a symmetric key block cipher derived from RC5.
		RC6 proper has a block size of 128 bits and supports key sizes of 128, 192 and 256 bits, but, like RC5, it can be parametrised to support a wide variety of word-lengths, key sizes and number of rounds.
		RC6 is very similar to RC5 in structure, using data-dependent rotations, modular addition and XOR operations; in fact, RC6 could be viewed as interweaving two parallel RC5 encryption processes.
	en.wikipedia.org /wiki/RC6 (190 words)

	RSA Security - 3.6.4 What are RC5 and RC6?
		RC6 is a block cipher based on RC5 and designed by Rivest, Sidney, and Yin for RSA Security.
		Like RC5, RC6 is a parameterized algorithm where the block size, the key size, and the number of rounds are variable; again, the upper limit on the key size is 2040 bits.
		RC6 is proprietary of RSA Security but can be freely used for research and evaluation purposes during the AES evaluation period.
	www.rsasecurity.com /rsalabs/node.asp?id=2251 (573 words)

	RSA Security - RC6® Block Cipher
		The RC6 block cipher was designed by Ron Rivest in collaboration with Matt Robshaw, Ray Sidney, and Yiqun Lisa Yin from RSA Laboratories.
		RC6 entered the final round as one of five algorithms, but the Belgian algorithm Rijndael was eventually selected for the AES.
		To promote RC6 further, RSA Laboratories has submitted the algorithm to the NESSIE project, the NP 18033 project (via the Swedish ISO/IEC JTC 1/SC 27 member body), and the Information-technology Promotion Agency in Japan.
	www.rsasecurity.com /rsalabs/node.asp?id=2512 (250 words)

	Block cipher -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-14)
		In (Act of writing in code or cipher) cryptography, a block cipher is a (Click link for more info and facts about symmetric key) symmetric key (A person of no influence) cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation.
		Block ciphers can be contrasted with (Click link for more info and facts about stream cipher) stream ciphers; a stream cipher operates on individual digits one at a time, and the transformation varies during the encryption.
		The cipher was developed by two (A native or inhabitant of Belgium) Belgian cryptographers, (Click link for more info and facts about Joan Daemen) Joan Daemen and (Click link for more info and facts about Vincent Rijmen) Vincent Rijmen, and submitted under the name Rijndael.
	www.absoluteastronomy.com /encyclopedia/b/bl/block_cipher.htm (1194 words)

	Feistel cipher . Blowfish (cipher) . Cryptography . XTEA . Data Encryption Standard . Don Coppersmith . RC6 . Stream ...
		The two main categories are transposition ciphers, which rearrange the order of letters in a message, and substitution ciphers, which systematically replace groups of letters with others.
		Classical ciphers tend to leak varying amounts of information about the statistics of the plaintext, and because of this they are easily broken, for example by frequency analysis.
		In a synchronous stream cipher a stream of pseudo-random digits is generated independently of the plaintext and ciphertext messages, and then combined with the plaintext to encrypt or the ciphertext to decrypt.
	www.uk.knowledge-info.org /Feistel_cipher-UK-3171331-tb (1176 words)

	RC6 (Site not responding. Last check: 2007-10-14)
		RC6 proper has a block size of 128 bits and supports key sizes of 128 192 and 256 bits like RC5 it can be parameterised to a wide variety of word-lengths key sizes number of rounds.
		RC6 is very similar RC5 in structure using data-dependent rotations modular addition and XOR operations; in fact RC6 could be as interweaving two parallel RC5 encryption processes.
		RC6 does use an extra multiplication operation present in RC5 in order to make rotation dependent on every bit in a and not just the least significant few
	www.freeglossary.com /RC6_cipher (160 words)

	RC4 (cipher)
		Though RSA officially terms it "Rivest Cipher 4", the RC acronym is generally understood to stand for "Ron's Code".
		Also publicly known are his block ciphers RC2 and RC5, and the block cipher RC6 which he designed with others.
		Like many such ciphers, it is essentially a pseudo-random number generator initialized from a secret key of up to 256 bytes.
	www.brainyencyclopedia.com /encyclopedia/r/rc/rc4__cipher_.html (768 words)

	Standard Cryptographic Algorithm Naming
		Ciphers that have different key schedules, but are otherwise identical are given different names (for example, SAFER-K and SAFER-SK).
		If the subkeys are not in fact random and independent (to a close-enough approximation), the cipher may become vulnerable to related-key attacks, and therefore particular care is needed from the application designer in choosing how to generate subkeys.
		These appear to be impractical when DEAL is used as a cipher (as opposed to a hash function using a construction such as Davies-Meyer).
	www.users.zetnet.co.uk /hopwood/crypto/scan/cs.html (6436 words)

	Report on AES2, Day 1 (Site not responding. Last check: 2007-10-14)
		RC6 does need a lot of RAM (170-200 bytes) and later in the evening River [ed- Rivest?] presented RC6a with a different key scheduler that requires only 25 bytes of RAM and also is twice as fast in assembler and five times as fast in C - Rivest's middle name of course is Merlin).
		He mentioned that if they were two AES ciphers and you used one bit of the key to chose one of them, then half the time you would use a less powerful cipher.
		Also if there should be a catastrophic failure with cipher A (a non zero probability), cipher B could be easily substituted just by fixing this one bit in the key.
	cryptome.quintessenz.at /mirror/aes2-day1.htm (3243 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Introduction Recognizing that the venerable DES cipher was reaching the end of its useful life, in January 1997 NIST (the National Institute of Stan- dards and Technology) announced a plan to select its successor, the AES (Advanced Encryption Standard).
		Some cipher algorithms have weak keys or keys that MUST not be used due to their interaction with some aspect of the cipher's definition.
		RC6: RC6 was invented by Ronald Rivest of MIT, and by Matthew Robshaw, Ray Sidney, and Yiqun Lisa Yin, all from RSA Laboratories.
	csrc.ncsl.nist.gov /ipsec/papers/aes-draft.00.txt (3146 words)

	Resources on Cryptography (Site not responding. Last check: 2007-10-14)
		During the design of RC6 our pragmatic aim was to satisfy as many goals as possible while keeping the cipher simple.
		Our analysis demonstrates that RC6 is highly resistant to differential and linear cryptanalytic attack, which are currently the two most effective analytical attacks on block ciphers.
		KASUMI is a block cipher that produces a 64-bit output from a 64-bit input under the control of a 128-bit key.
	www.rootshell.be /~glc01x/crypto-bibliography.html (2571 words)

	The RC6 Block Cipher (Site not responding. Last check: 2007-10-14)
		RC6 is a fully parameterized family of encryption algorithms originally submitted to NIST for consideration as the
		RC6 is a symmetric-key algorithm which encrypts 128-bit plaintext blocks to 128-bit ciphertext blocks.
		In addition to the RC6 computation path, each processor contains a control unit which simply consists in a token associated with each plaintext block (signal Cin).
	perso.ens-lyon.fr /jean-luc.beuchat/RC6 (365 words)

	RC6BlockCipher (SeMoA API Documentation) (Site not responding. Last check: 2007-10-14)
		This method initializes the block cipher with a certain secret key for data encryption.
		This method decrypts a single block of data, and may only be called, when the block cipher is in decrytion mode.
		This method encrypts a single block of data, and may only be called, when the block cipher is in encrytion mode.
	www.semoa.org /docs/api/cdc/standard/rc6/RC6BlockCipher.html (556 words)

	The RC6 Block Cipher - Rivest, Robshaw, Sidney, Yin (ResearchIndex) (Site not responding. Last check: 2007-10-14)
		RC6 is an evolutionary improvement of RC5, designed to meet the requirements of the Advanced Encryption Standard (AES).
		FPGA Implementations of the RC6 Block Cipher Jean-Luc..
		MARS - a candidate cipher for AES - Burwick, al.
	citeseer.ist.psu.edu /rivest98rc.html (522 words)

	RC6 - TheBestLinks.com - Advanced Encryption Standard, Blowfish (cipher), Block cipher, Cryptography, ... (Site not responding. Last check: 2007-10-14)
		RC6 - TheBestLinks.com - Advanced Encryption Standard, Blowfish (cipher), Block cipher, Cryptography,...
		RC6, Advanced Encryption Standard, Blowfish (cipher), Block cipher...
		RC6 proper has a block size of 128 bits and supports key sizes of 128, 192 and 256 bits, but, like RC5, it can be parameterised to support a wide variety of word-lengths, key sizes and number of rounds.
	www.thebestlinks.com /RC6.html (233 words)

	Additional encryption modules for BestCrypt
		As he wrote: "Serpent is a block cipher developed by Ross Anderson, Eli Biham and Lars Knudsen.
		The algorithm is developed by Xuejia Lai and James Massey, originally called PES in 1990, then authours strengthened the cipher and called it IDEA in 1992.
		Michael Oestergaard Pedersen developed Encryption Algorithm module for BestCrypt which uses the RC6 algorithm with 256-bit key and 16-bytes blocks in Cipher Block Chaining mode.
	www.jetico.com /plugins.htm (991 words)

	Re: Avoiding C++ Templates In Cipher Implementation
		:) Cipher algorithms are so straightforward that if you copy them ver batim from the specification, the templated version should look very much like the hard-coded version with fewer variables and no dynamic memory allocation.
		May I remind the readers that my original assertion is not without supporting data - I have an entire collection of both symmetric and asymmetric ciphers implemented as templates, and they compile without fault on many major compilers.
		With the C version, many times the key will be represented as an unstructured array of characters making it difficult to work with the key as a true object.
	www.talkaboutprogramming.com /group/comp.lang.c++/messages/746226.html (296 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		For example, if rc6 were suceptable to an attack that could break all 20 rounds, the addition of a 21st or 22nd round may be an option.
		RC6 is significantly higher latency, as shown in all the hardware papers presented.
		RC6 is a poor candidate, due to its intrinsic latency and lack of subkey agility.
	csrc.nist.gov /encryption/aes/round2/comments/R2comments.txt (19029 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		NAME Crypt::RC6 - Perl RC6 block cipher encryption module SYNOPSIS use Crypt::RC6; my $cipher = new Crypt::RC6 $key; my $ciphertext = $cipher->encrypt($plaintext); my $plaintext = $cipher->decrypt($ciphertext); DESCRIPTION From THE RC6 BLOCK CIPHER, by Rivest, Robshaw, Sidney, and Yin...
		New features of RC6 include the use of four working registers instead of two, and the inclusion of integer multiplication as an additional primitive operation.
		The use of multiplication greatly increases the diffusion achieved per round, allowing for greater security, fewer rounds, and increased throughput." This implementation requires the use of a 16-, 24-, or 32-byte key and 16-byte blocks for encryption/decryption.
	www.cpan.org /modules/by-module/Crypt/Crypt-RC6-0.05.readme (154 words)

	[No title]
		The first (leftmost) + bit of this key string as defined in the DFC + abstract is the most significant bit of word 0 + and the rightmost bit of this string is the least + signicant bit of the highest numbered key word.
		The most significant bit of word 0 is + the 1st (leftmost) bit of the 128 bit input string + and the least significant bit of word 3 is the + last (rightmost) bit.
		It breaks the 64-bit cipher block into four 16-bit words + * because all of the primitive inner operations are done with 16-bit + * arithmetic.
	www.citi.umich.edu /projects/nfsv4/feb_2002_rel/cryptoapi-2.4.10.diff (2593 words)

	RC6 encryption algorithm : RC6 cipher
		RC6 is a symmetric key[?] block cipher developed from the RC5.
		It was designed by Rivest, Sidney and Yin to meet the requirements of the AES competition.
		Information on the AES algorithm (Rijndael) is available, including test values, intellectual property (IP) statements, and specifications.
	www.fastload.org /rc/RC6_cipher.html (150 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Compare a + file encrypted with a cipher with very good safe: The document is in + it, you can carry the document with you (if the safe is not too + heavy), but others can steal it, too.
		The AES cipher is implemented by the rijndael + module, but with a separate cipher id/name.
		RC6 encryption is only available if you ++are using the international kernel and RC6 encryption has been ++enabled in the Crypto API.
	www.zone-h.org /download/file=2544 (8858 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		RC6(3) User Contributed Perl Documentation RC6(3) NAME Crypt::RC6 - Crypt::CBC compliant RC6 block cipher encryption module SYNOPSIS use Crypt::RC6; my $cipher = new Crypt::RC6 $key; my $ciphertext = $cipher->encrypt($plaintext); my $plaintext = $cipher->decrypt($ciphertext); DESCRIPTION From THE RC6 BLOCK CIPHER, by Rivest, Robshaw, Sidney, and Yin...
		Like RC5, RC6 makes essential use of data-dependent rotations.
		New features of RC6 include the use of four working registers instead of two, and the inclusion of integer multiplication as an additional primitive opera- tion.
	www.infocopter.com /perl_corner/crypt-rc6.htm (163 words)

	FPGA Implementations of the RC6 Block Cipher (ResearchIndex)
		Abstract: RC6 is a symmetric-key algorithm which encrypts 128-bit plaintext blocks to 128-bit ciphertext blocks.
		The encryption process involves four operations: integer addition modulo 2, bitwise exclusive or of two w-bit words, rotation to the left, and computation of f(X)= (X(2X + 1)) mod 2, which is the critical arithmetic operation of this block cipher.
		In this paper, we investigate and compare four implementations of the f(X) operator on Virtex-E and Virtex-II devices.
	citeseer.ist.psu.edu /beuchat03fpga.html (290 words)

	Cryptography
		Later, Hebrew scholars made use of simple substitution ciphers (such as the Atbash cipher) beginning perhaps around 500 to 600 BCE.
		Herodutus tells us of secret messages physically concealed beneath wax on wooden tablets or as a tattoo on a slave's head concealed by regrown hair (see secret writing; these are not properly examples of cryptography).
		The Romans certainly did (eg, the Caesar cipher and its variations).
	www.php-include.com /Cryptography.php (3951 words)

	Citations: The RC6 TM block cipher - Rivest (ResearchIndex) (Site not responding. Last check: 2007-10-14)
		Rivest, M. Robshaw, R. Sidney, and Y. Yin "The RC6^TM Block Cipher", 1 AES conference, Ventura, CA, August 1998.
		Rivest, M. Robshaw, R. Sidney, and Y. Yin, "The RC6 TM Block Cipher," in First Advanced En- cryption Standard (AES) Conference, (Ventura, CA), 1998.
		Rivest et al., "The RC6 TM block cipher", AES 1.
	citeseer.ist.psu.edu /context/1095242/0 (508 words)

	CS551: Manifest 11-13 September 2000 (Site not responding. Last check: 2007-10-14)
		Twofish, based on Blowfish, is one of the five finalist candidates to replace DES.
		RC6 is an AES finalist based on RC5.
		The only way to get the NSA to admit to the ability to break a given algorithm is to encrypt something so valuable that its public dissemination is worth the admission.
	www.cs.virginia.edu /~evans/cs551/manifests/0911.html (209 words)

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