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        RFC 2104:

        Title:      HMAC: Keyed-Hashing for Message Authentication
        Author:     H. Krawczyk, M. Bellare, R. Canetti
        Date:       February 1997
        Mailbox:    hugo@watson.ibm.com, mihir@cs.ucsd.edu, 
                    canetti@watson.ibm.com
        Pages:      11
        Characters: 22297
        Updates/Obsoletes: None

        URL:        ftp://ds.internic.net/rfc/rfc2104.txt


This document describes HMAC, a mechanism for message authentication
using cryptographic hash functions. HMAC can be used with any
iterative cryptographic hash function, e.g., MD5, SHA-1, in
combination with a secret shared key.  The cryptographic strength
of HMAC depends on the properties of the underlying hash function.
This document is the product of the IP Security Protocol Working Group
of the IETF.

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Joyce K. Reynolds and Mary Kennedy
USC/Information Sciences Institute