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• W26151103 abstract "The idea of double block length hashing is to construct a compression function on 2n bits using a block cipher with an n-bit block size. All optimally secure double length hash functions known in the literature employ a cipher with a key space of double block size, 2n-bit. On the other hand, no optimally secure compression functions built from a cipher with an n-bit key space are known. Our work deals with this problem. Firstly, we prove that for a wide class of compression functions with two calls to its underlying n-bit keyed block cipher collisions can be found in about 2 n/2 queries. This attack applies, among others, to functions where the output is derived from the block cipher outputs in a linear way. This observation demonstrates that all security results of designs using a cipher with 2n-bit key space crucially rely on the presence of these extra n key bits. The main contribution of this work is a proof that this issue can be resolved by allowing the compression function to make one extra call to the cipher. We propose a family of compression functions making three block cipher calls that asymptotically achieves optimal collision resistance up to 2 n(1 − ε) queries and preimage resistance up to 23n(1 − ε)/2 queries, for any ε > 0. To our knowledge, this is the first optimally collision secure double block length construction using a block cipher with single length key space." @default.
• W26151103 created "2016-06-24" @default.
• W26151103 creator A5032130714 @default.
• W26151103 date "2012-01-01" @default.
• W26151103 modified "2023-10-03" @default.
• W26151103 title "Optimal Collision Security in Double Block Length Hashing with Single Length Key" @default.
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• W26151103 doi "https://doi.org/10.1007/978-3-642-34961-4_32" @default.
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