Cryptology ePrint Archive: Report 2002/170

An Analysis of RMAC

Jack Lloyd

Abstract: A recent trend in message authentication is the use of a randomizing parameter, such that the authentication tag is based not only on the message and the key, but a public nonce which is changed for every authenticated message. This generally affords a better security proof. However, several new classes of attacks are made available by these techniques. We examine these attacks, and apply some of them to RMAC, a recently published MAC mechanism.

Category / Keywords: secret-key cryptography / message authentication codes, cryptanalysis

Date: received 11 Nov 2002, last revised 18 Nov 2002

Contact author: lloyd at acm jhu edu

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Version: 20021118:214927 (All versions of this report)

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