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• W2917189407 abstract "The indifferentiability framework has been tailored to evaluate the security of cryptographic hash functions such that an iterative hash function must be indifferentiable from a random oracle in order to behave as a random oracle in cryptosystems. It was found that popular (strengthened) Merkle-Damgard transformation cannot satisfy the notion of indifferentiability from a random oracle due to a length-extension attack. Thus, a series of Merkle-Damgard variants have been proposed. This paper mainly revisits one of them, Prefix-Free Merkle-Damgard (PF-MDHF), which is to use a prefix-free message padding. Our main contribution is to provide a tighter security bound for prefix-free Merkle-Damgard with respect to the indifferentiability from a random oracle. More precisely, our bound is (O( (ell ^2q+ell q^2)/{2^n})), while in previous papers the bound is (O(ell ^2q^2/2^n)), where (ell ) is the maximum block length of queries, and q is the maximum number of queries." @default.
• W2917189407 created "2019-03-02" @default.
• W2917189407 creator A5011132912 @default.
• W2917189407 creator A5074349547 @default.
• W2917189407 date "2019-01-01" @default.
• W2917189407 modified "2023-09-27" @default.
• W2917189407 title "Improved Indifferentiability Security Bound for the Prefix-Free Merkle-Damgård Hash Function" @default.
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• W2917189407 doi "https://doi.org/10.1007/978-3-030-14234-6_11" @default.
• W2917189407 hasPublicationYear "2019" @default.
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