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draft-baldwin-rc5-00.txt
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.
Internet-Drafts are available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in,
type "cd internet-drafts" and then
"get draft-baldwin-rc5-00.txt".
A URL for the Internet-Draft is:
ftp://ds.internic.net/internet-drafts/draft-baldwin-rc5-00.txt
Internet-Drafts directories are located at:
o Africa
Address: ftp.is.co.za (196.4.160.8)
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Address: ftp.nis.garr.it (193.205.245.10)
o Pacific Rim
Address: munnari.oz.au (128.250.1.21)
o US East Coast
Address: ds.internic.net (198.49.45.10)
o US West Coast
Address: ftp.isi.edu (128.9.0.32)
Internet-Drafts are also available by mail.
Send a message to: mailserv@ds.internic.net. In the body type:
"FILE /internet-drafts/draft-baldwin-rc5-00.txt".
NOTE: The mail server at ds.internic.net can return the document in
MIME-encoded form by using the "mpack" utility. To use this
feature, insert the command "ENCODING mime" before the "FILE"
command. To decode the response(s), you will need "munpack" or
a MIME-compliant mail reader. Different MIME-compliant mail readers
exhibit different behavior, especially when dealing with
"multipart" MIME messages (i.e., documents which have been split
up into multiple messages), so check your local documentation on
how to manipulate these messages.
For questions, please mail to Internet-Drafts@cnri.reston.va.us.
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version
of the Internet-Draft.
--NextPart
Content-Type: Multipart/Alternative; Boundary="OtherAccess"
--OtherAccess
Content-Type: Message/External-body;
access-type="mail-server";
server="mailserv@ds.internic.net"
Content-Type: text/plain
Content-ID: <19960328141449.I-D@CNRI.Reston.VA.US>
ENCODING mime
FILE /internet-drafts/draft-baldwin-rc5-00.txt
--OtherAccess
Content-Type: Message/External-body;
name="draft-baldwin-rc5-00.txt";
site="ds.internic.net";
access-type="anon-ftp";
directory="internet-drafts"
Content-Type: text/plain
Content-ID: <19960328141449.I-D@CNRI.Reston.VA.US>
--OtherAccess--
--NextPart--