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. In this paper we present an improvement of the differentialattack on hash functions based on block ciphers. By using the specificproperties of the collision attack on hash functions, we can greatly reducethe work factor to find a pair that follows the characteristic. We proposea new family of differential characteristics that is especially useful incombination with our improvement. Attacks on a hash function basedon DES variants reduced to 12, 13 or 15 rounds become faster than brute...

Improved characteristics for differential cryptanalysis of hash functions based on block ciphers