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Attacks on Fast Double Block Length Hash Functions
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Attacks on Fast Double Block Length Hash Functions
Lars R. Knudsen1, Xuejia Lai2 and Bart Preneel3
| (1) |
Katholieke Universiteit Leuven, Kardinaal Mercierlaan 94, B-3001 Heverlee, Belgium, BE |
| (2) |
R3 Security Engineering, Aathal, Switzerland, CH |
| (3) |
Katholieke Universiteit Leuven, Kardinaal Mercierlaan 94, B-3001 Heverlee, Belgium, BE |
Abstract. The security of hash functions based on a block cipher with a block length of m bits and a key length of k bits, where , is considered. New attacks are presented on a large class of iterated hash functions with a 2m -bit hash result which processes in each iteration two message blocks using two encryptions. In particular, the attacks break
three proposed schemes: Parallel-DM, the PBGV hash function, and the LOKI DBH mode.
Key words. Cryptanalysis, Cryptographic hash functions, Block ciphers, Double block length hash functions, Birthday attacks.
Received 1 March 1996 and revised 16 December 1996
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