Faster Multicollisions
Faster Multicollisions
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DOI:
10.1007/978-3-540-89754-5_6
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发表时间:
2008-12
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影响因子:
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通讯作者:
Jean-Philippe Aumasson
中科院分区:
文献类型:
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作者:
Jean-Philippe Aumasson
Joux’s multicollision attack is one of the most striking results on hash functions and also one of the simplest: it computes ak-collision on iterated hashes in time, whereask!1/k·2n(k− 1)/kwas thought to be optimal. Kelsey and Schneier improved this to 3·2n/2if storage 2n/2is available and if the compression functions admits easily found fixed-points. This paper presents a simple technique that reduces this cost to 2n/2and negligible memory, when the IV can be chosen by the attacker. Additional benefits are shorter messages than the Kelsey/Schneier attack and cost-optimality.