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- W2951289401 abstract "At Crypto 2005, Coron et al. introduced a formalism to study the presence or absence of structural flaws in iterated hash functions. If one cannot differentiate a hash function using ideal primitives from a random oracle, it is considered structurally sound, while the ability to differentiate it from a random indicates a structural weakness. This model was devised as a tool to see subtle real world weaknesses while in the random world. In this paper we take in a practical point of view. We show, using well known examples like NMAC and the Mix-Compress-Mix (MCM) construction, how we can prove a hash construction secure and insecure at the same time in the setting. These constructions do not differ in their implementation but only on an abstract level. Naturally, this gives rise to the question what to conclude for the implemented hash function.Our results cast doubts about the notion of indifferentiability from a random oracle to be a mandatory, practically relevant criterion (as e.g., proposed by Knudsen [17] for the SHA-3 competition) to separate good hash structures from bad ones." @default.
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- W2951289401 date "2010-01-01" @default.
- W2951289401 modified "2023-10-03" @default.
- W2951289401 title "Some Observations on Indifferentiability." @default.
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