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
期刊:
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影响因子:
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通讯作者:
Jean-Philippe Aumasson
Jean-Philippe Aumasson
中科院分区:
其他
文献类型:
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作者:
Jean-Philippe Aumasson

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Joux的多重冲突攻击是散列函数中最引人注目的结果之一,也是最简单的结果之一:它在时间上计算迭代散列的ak-冲突,其中k!1/k·2n(k− 1)/k被认为是最优的。凯尔西和Schneier将其改进为3·2n/2,如果存储器是可用的,如果压缩函数允许容易找到的不动点。本文提出了一种简单的技术,减少这种成本为2n/2和可忽略的内存,当IV可以选择的攻击者。额外的好处是比凯尔西/Schneier攻击更短的消息和成本最优性。
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.