Two new attacks are given on a CDC-MAC algorithm due to Knudsen and Preneel, which is in the final stages of being standardised as MAC Algorithm 4 in ISO/IEC FDIS 9797-1. The attacks are significantly more efficient than previously known attacks, which means that the inclusion of this scheme in the standard will need to be reconsidered.
By: Don Coppersmith, Chris J. Mitchell
Published in: Electronics Letters, volume 35, (no 19), pages 1626-7 in 1999
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