Better Than Advertised: Improved Collision-Resistance Guarantees for MD-Based Hash Functions
Better Than Advertised: Improved Collision-Resistance Guarantees for MD-Based Hash Functions
复制标题
比宣传的更好:改进基于 MD 的哈希函数的抗碰撞保证
DOI:
10.1145/3133956.3134087
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
Len, Julia
中科院分区:
文献类型:
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作者:
Bellare, Mihir;Jaeger, Joseph;Len, Julia
The MD transform that underlies the MD and SHA families iterates a compression functionhto get a hash functionH. The question we ask is, what property X ofhguarantees collision resistance (CR) ofH? The classical answer is that X itself be CR. We show that weaker conditions X, in particular forms of what we call constrained-CR, suffice. This reduces demands on compression functions, to the benefit of security, and also, forensically, explains why collision-finding attacks on compression functions have not, historically, lead to immediate breaks of the corresponding hash functions. We obtain our results via a definitional framework called RS security, and a parameterized treatment of MD, that also serve to unify prior work and variants of the transform.
DOI:
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发表时间:
2017
期刊:
IACR Cryptology ePrint Archive
影响因子:
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作者:
Benedikt Auerbach;David Cash;Manuel Fersch;Eike Kiltz
通讯作者:
Eike Kiltz
DOI:
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发表时间:
2004
期刊:
IACR Cryptology ePrint Archive
影响因子:
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作者:
G. Laccetti;G. Schmid
通讯作者:
G. Schmid