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RC4 - The pseudo-random generation algorithm PRGA | A Wisdom Archive on RC4 - The pseudo-random generation algorithm PRGA | | RC4 - The pseudo-random generation algorithm PRGA A selection of articles related to RC4 - The pseudo-random generation algorithm PRGA | |
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RC4, RC4 - Description, RC4 - Fluhrer Mantin and Shamir attack, RC4 - History, RC4 - Implementation, RC4 - RC4-based cryptosystems, RC4 - Security, RC4 - The key-scheduling algorithm KSA, RC4 - The pseudo-random generation algorithm PRGA
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ARTICLES RELATED TO RC4 - The pseudo-random generation algorithm PRGA | | | |  RC4 - The pseudo-random generation algorithm PRGA: Encyclopedia II - RC4 - DescriptionRC4 generates a pseudorandom stream of bits (a "keystream") which, for encryption, is combined with the plaintext using XOR as with any Vernam cipher; decryption is performed the same way. To generate the keystream, the cipher makes use of a secret internal state which consists of two parts:
A permutation of all 256 possible bytes (denoted "S" below).
Two 8-bit index-pointers (denoted "i" and "j").
The permutation is initialised with a variable length key, typically between 40 and 256 bits, using the ke ...
See also:RC4, RC4 - History, RC4 - Description, RC4 - The pseudo-random generation algorithm PRGA, RC4 - The key-scheduling algorithm KSA, RC4 - Implementation, RC4 - Security, RC4 - Fluhrer Mantin and Shamir attack, RC4 - RC4-based cryptosystems Read more here: » RC4: Encyclopedia II - RC4 - Description |
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| | | | RC4 - The pseudo-random generation algorithm PRGA: Encyclopedia II - RC4 - Security RC4 falls short of the standards set by cryptographers for a secure cipher in several ways, and thus is not recommended for use in new applications.
The keystream generated by RC4 is slightly biased in favour of certain sequences of bytes. The best attack based on this bias is due to Fluhrer and McGrew, which will distinguish the keystream from a random stream given a gigabyte of output.
RC4 does not take a separate nonce alongside the key. As with any cipher, but particularly with Vernam ciphers, such a nonce is a requirement ...
See also:RC4, RC4 - History, RC4 - Description, RC4 - The pseudo-random generation algorithm PRGA, RC4 - The key-scheduling algorithm KSA, RC4 - Implementation, RC4 - Security, RC4 - Fluhrer Mantin and Shamir attack, RC4 - RC4-based cryptosystems Read more here: » RC4: Encyclopedia II - RC4 - Security |
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| | | | RC4 - The pseudo-random generation algorithm PRGA: Encyclopedia II - RC4 - History RC4 was designed by Ron Rivest of RSA Security in 1987; while it is officially termed "Rivest Cipher 4", the RC acronym is alternatively understood to stand for "Ron's Code" (see also RC2, RC5 and RC6).
RC4 was initially a trade secret, but in September 1994 a description of it was anonymously posted to the Cypherpunks mailing list. It was soon posted on the sci.crypt newsgroup, and from there to many sites on the Internet. Because the algorithm is known, it is no longer a trade secret. The name "RC4" is trademarked, however. The curr ...
See also:RC4, RC4 - History, RC4 - Description, RC4 - The pseudo-random generation algorithm PRGA, RC4 - The key-scheduling algorithm KSA, RC4 - Implementation, RC4 - Security, RC4 - Fluhrer Mantin and Shamir attack, RC4 - RC4-based cryptosystems Read more here: » RC4: Encyclopedia II - RC4 - History |
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