draft-baldwin-rc5-00.txt

[baldwin <[e-mail]>]

        The draft that describes how to create interoperable implementations
of the RC5 cipher and its various modes is now available for the IETF file 
servers.  We would appreciate any comments and suggestions on this draft.

                --Bob Baldwin


A New Internet-Draft is available from the on-line Internet-Drafts 
directories.                                                         

       Title     : The RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS Algorithms 
       Author(s) : R. W. Baldwin and R. L. Rivest
       Filename  : draft-baldwin-rc5-00.txt 
       Pages     : 35
       Date      : 03/20/1996

This document defines four ciphers with enough detail to ensure 
interoperability between different implementations.  The first cipher is the 
raw RC5 block cipher.  The RC5 cipher takes a fixed size input block and 
produces a fixed sized output block using a transformation that depends on a 
key.  The second cipher, RC5-CBC, is the Cipher Block Chaining (CBC) mode 
for RC5.  It can process messages whose length is a multiple of the RC5 
block size.  The third cipher, RC5-CBC-Pad, handles plaintext of any length, 
though the ciphertext will be longer than the plaintext by at most the size 
of a single RC5 block.  The RC5-CTS cipher is the Cipher Text Stealing mode 
of RC5, which handles plaintext of any length and the ciphertext length 
matches the plaintext length.  The RC5 cipher was invented by Professor 
Ronald L. Rivest of the Massachusetts Institute of Technology in 1994.  It 
is a very fast and simple algorithm that is parameterized by the block size, 
the number of rounds, and key length.  These parameters can be adjusted to 
meet different goals for security, performance, and exportability.  RSA Data 
Security Incorporated has filed a patent application on the RC5 cipher and 
for trademark protection for RC5, RC5-CBC, RC5-CBC-Pad, RC5-CTS and assorted 
variations.

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