Use of Block Ciphers for Message Authentication

Document Type Expired Internet-Draft (individual)
Author Ben Rogers 
Last updated 1998-02-13
Stream (None)
Intended RFC status (None)
Expired & archived
plain text pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This draft describes CBC-MAC, a method for using encryption functions to produce message authentication hashes. CBC-MAC can be used with any block cipher (eg. DES, 3DES, Blowfish) in combination with a secret key appropriate for that cipher. The cryptographic strength of this authentication depends on the strength of the algorithm, and may be influenced by other factors appropriate to the algorighm (eg. Weak Keys for DES).


Ben Rogers (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)