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Creators/Authors contains: "Len, Julia"

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  1. ; ; ; (, Advances in Cryptology - Eurocrypt)
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  2. ; ; ; (, USENIX Security)
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  3. ; ; (, USENIX Security Symposium)
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  4. ; ; (, CCS '17 Proceedings of the 2017 ACM SIGSAC Conference on Computer and Communications Security)
    The MD transform that underlies the MD and SHA families iterates a compression function h to get a hash function H. The question we ask is, what property X of h guarantees collision resistance (CR) of H? 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. 
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