Download PDF by Xiaoyun Wang, Hongbo Yu, Yiqun Lisa Yin (auth.), Victor: Advances in Cryptology – CRYPTO 2005: 25th Annual

By Xiaoyun Wang, Hongbo Yu, Yiqun Lisa Yin (auth.), Victor Shoup (eds.)

ISBN-10: 3540281142

ISBN-13: 9783540281146

This booklet constitutes the refereed complaints of the twenty fifth Annual foreign Cryptology convention, CRYPTO 2005, held in Santa Barbara, California, united states in August 2005.

The 33 revised complete papers provided have been conscientiously reviewed and chosen from 178 submissions. The papers are equipped in topical sections on hash capabilities, thought, cryptanalysis, 0 wisdom, anonymity, privateness, broadcast encryption, human-oriented cryptography, mystery sharing, multi-party computation, random oracles, details theoretic safeguard, and primitives and protocols.

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Read or Download Advances in Cryptology – CRYPTO 2005: 25th Annual International Cryptology Conference, Santa Barbara, California, USA, August 14-18, 2005. Proceedings PDF

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Additional info for Advances in Cryptology – CRYPTO 2005: 25th Annual International Cryptology Conference, Santa Barbara, California, USA, August 14-18, 2005. Proceedings

Example text

Each fixed hint yields a choice of S and a guess of the bits of S. For any fixed hint, the probability, over choice of b1 , . . , bu , that all the guessed Pebbling and Proofs of Work 45 values are consistent with the values of the elements of S is 2−k . Therefore, by summing over all hints, the probability that there exists a hint yielding a guess consistent with the actual value of b1 , . . , bu is 2B−k . Suppose there are s + z/w + 1 pebbles at some point in the ex post facto pebbling. We apply the claim to bound the probability that this occurs, as follows: the independent unbiased random bits b1 , .

2005. 30 A X. L. Yin, and H. Yu Appendix: Tables Table 5. Disturbance vectors of SHA-1. , 95) satisfy the SHA-1 message expansion recursion, but no other conditions. The second italicized index is only needed for numbering the 80 vectors that are chosen for constructing the best 80-step near collision. index i 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 index 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 vector index index vector index index vector xi−1 i xi−1 i xi−1 e0000000 33 17 80000002 65 49 2 2 34 18 0 66 50 0 2 35 19 2 67 51 0 80000000 36 20 0 68 52 0 1 37 21 3 69 53 0 0 38 22 0 70 54 0 80000001 39 23 2 71 55 0 2 40 24 2 72 56 0 40000002 41 25 1 73 57 0 2 42 26 0 74 58 0 2 43 27 2 75 59 0 80000000 44 28 2 76 60 0 2 45 29 1 77 61 0 0 46 30 0 78 62 0 80000001 47 31 0 79 63 0 0 48 32 2 80 64 0 40000001 49 33 3 81 65 4 2 50 34 0 82 66 0 2 51 35 2 83 67 0 80000002 52 36 2 84 68 8 1 53 37 0 85 69 0 0 54 38 0 86 70 0 80000001 55 39 2 87 71 10 2 56 40 0 88 72 0 2 57 41 0 89 73 8 2 58 42 0 90 74 20 0 59 43 2 91 75 0 0 60 44 0 92 76 0 1 61 45 2 93 77 40 0 62 46 0 94 78 0 80000002 63 47 2 95 79 28 2 64 48 0 96 80 80 Finding Collisions in the Full SHA-1 31 Table 6.

We need that the “surviving” graph is still hard to pebble. We will also introduce the concept of spontaneously generated pebbles to capture memory reads. We show that pebbling remains hard unless the number of spontaneously generated pebbles is large. We must ensure that no cut in the graph is knocked out. Intuitively, knocking out a cut in the graph corresponds to reducing the depth of the graph, and therefore reducing the difficulty of pebbling the graph. This leads us to a graph with slightly special structure: it is the concatenation of two pieces.

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Advances in Cryptology – CRYPTO 2005: 25th Annual International Cryptology Conference, Santa Barbara, California, USA, August 14-18, 2005. Proceedings by Xiaoyun Wang, Hongbo Yu, Yiqun Lisa Yin (auth.), Victor Shoup (eds.)


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