Rivest ciphers: Difference between revisions
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== RC5 == | == RC5 == | ||
'''RC5''' is a [[block cipher]] with 64-bit blocks, one of the [[DES generation]] of block ciphers. It was the first well-known cipher to make extensive use of data-dependent rotations to achieve nonlinearity. It is a [[Feistel cipher]]. | '''RC5''' is a [[block cipher]] with 64-bit blocks, one of the [[Block_cipher#20th_century_block_ciphers|DES generation]] of block ciphers. It was the first well-known cipher to make extensive use of data-dependent rotations to achieve nonlinearity. It is a [[Feistel cipher]]. | ||
There is an RFC giving an RC5 specification for Internet use; see [[Block_cipher/External_Links#RFCs_for_block_ciphers | external links]]. | There is an RFC giving an RC5 specification for Internet use; see [[Block_cipher/External_Links#RFCs_for_block_ciphers | external links]]. | ||
Its descendant RC6, also using data-dependent rotations, was an AES finalist. RSA Security have a page describing both ciphers; see [[Block_cipher/External_Links#Homepages_for_block_ciphers | external links]]. | Its descendant RC6, also using data-dependent rotations, was an AES finalist. RSA Security have a page describing both ciphers; see [[Block_cipher/External_Links#Homepages_for_block_ciphers | external links]]. | ||
==RC6== | |||
'''RC6''' is a [[block cipher]] that was a finalist in the [[AES competition]]. Like all [[Advanced Encryption Standard|AES]] candidates, it uses 128-bit blocks and supports key sizes of 128, 192 or 256 bits. | |||
Like [[#RC5 | RC5]], RC6 made extensive use of data-dependent rotations. [[RSA Security]] have a page describing both ciphers; see [[Block_cipher/External_Links#Homepages_for_block_ciphers | external links]]. | |||
RC6 is the only one of the five finalists which does not have a completely open license; it is still proprietary to RSA Security. | |||
Revision as of 22:34, 23 July 2009
Ron Rivest, an MIT professor and one of the founders of RSA Security, has devised a number of ciphers for that company, either alone or with collaborators. These designs are designated as RCn. Officially, "RC" stands for Rivest Cipher; it may also be taken as "Ron's Code".
RC2
RC4
RC4 is a very widely deployed stream cipher.
RC5
RC5 is a block cipher with 64-bit blocks, one of the DES generation of block ciphers. It was the first well-known cipher to make extensive use of data-dependent rotations to achieve nonlinearity. It is a Feistel cipher.
There is an RFC giving an RC5 specification for Internet use; see external links.
Its descendant RC6, also using data-dependent rotations, was an AES finalist. RSA Security have a page describing both ciphers; see external links.
RC6
RC6 is a block cipher that was a finalist in the AES competition. Like all AES candidates, it uses 128-bit blocks and supports key sizes of 128, 192 or 256 bits.
Like RC5, RC6 made extensive use of data-dependent rotations. RSA Security have a page describing both ciphers; see external links.
RC6 is the only one of the five finalists which does not have a completely open license; it is still proprietary to RSA Security.