Download e-book for iPad: Fast Software Encryption: 20th International Workshop, FSE by Shiho Moriai

By Shiho Moriai

This booklet constitutes the completely refereed post-conference court cases of the twentieth foreign Workshop on quick software program Encryption, held in Singapore, March 11-13, 2013. The 30 revised complete papers provided have been rigorously reviewed and chosen from ninety seven preliminary submissions. The papers are prepared in topical sections on block ciphers, light-weight block ciphers, tweakable block ciphers, circulation ciphers, hash features, message authentication codes, provable safety, implementation features, light-weight authenticated encryption, computerized cryptanalysis, Boolean functions.

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Extra resources for Fast Software Encryption: 20th International Workshop, FSE 2013, Singapore, March 11-13, 2013. Revised Selected Papers

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Even in the new form presented in Lemma 1, the wrong key randomisation hypothesis remains an idealisation. In order to verify that it reflects the reality with reasonable accuracy, we have experimentally determined the distribution of the sample bias over 216 wrong keys for two structurally very different small-scale ciphers with a block length of 20 bits: SmallPresent-20 [22] with 8 rounds, and RC6-5/6/10 [31] with four 5-bit words, 6 rounds and an 80-bit key. In both cases, the number of samples was N = 216 .

2 The following lemma, which is a new result, takes this into account. Lemma 1. In a linear attack with Matsui’s Algorithm 2 on an n-bit block cipher using N known plaintexts, the sample bias ξw of the wrong keys approximately follows a normal distribution with mean zero and variance 1/4 · (1/N + 1/2n ): ξw ∈ N (0, 1/4 1 1 + n ). N 2 (5) 26 A. Bogdanov and E. Tischhauser Proof. See the full version [7] of this paper for the proof. Previous interpretations of the wrong key randomisation hypothesis have therefore used the mean zero instead of the full distribution N (0, 2−n−2 ) for the bias when decrypting with a wrong key.

4. Section 5 proposes a method of computing the data complexity of a linear attack and presents experimental results. Our refined key equivalence hypothesis is presented in Sect. 6. Section 7 proposes a practical algorithm implementing the new key equivalence hypothesis for key-alternating ciphers. We conclude in Sect. 8. 1 Notation We denote by F2 = {0, 1} the finite field with two elements and the n-dimensional vector space over F2 by Fn2 . The canonical scalar product of two vectors a, b ⊕ Fn2 is denoted by aT b.

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