New PDF release: Advances in Cryptology - CRYPTO 2009: 29th Annual

By Nadia Heninger, Hovav Shacham (auth.), Shai Halevi (eds.)

ISBN-10: 3642033563

ISBN-13: 9783642033568

This publication constitutes the refereed court cases of the twenty ninth Annual foreign Cryptology convention, CRYPTO 2009, held in Santa Barbara, CA, united states in August 2009.

The 38 revised complete papers awarded have been conscientiously reviewed and chosen from 213 submissions. Addressing all present foundational, theoretical and learn facets of cryptology, cryptography, and cryptanalysis in addition to complicated purposes, the papers are prepared in topical sections on key leakage, hash-function cryptanalysis, privateness and anonymity, interactive proofs and zero-knowledge, block-cipher cryptanalysis, modes of operation, elliptic curves, cryptographic hardness, merkle puzzles, cryptography within the actual global, assaults on signature schemes, mystery sharing and safe computation, cryptography and game-theory, cryptography and lattices, identity-based encryption and cryptographers’ toolbox.

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Additional resources for Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009. Proceedings

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In Section 4 we present our generic construction from hash proof systems, and provide a simple and efficient instantiation. In Section 5 we present our two proposals that are resilient to any key leakage of L(1 − o(1)) bits, and provide a comparison between them. In Section 6 we present several generalizations of the framework considered in this paper that are satisfied by our schemes. Due to space limitations we refer the reader to [28] for our results in the setting of chosen-ciphertext security and weak key-leakage attacks.

We present three ID scheme constructions, which build on top of one another. First we notice that a generalization of the discrete-log based Okamoto ID scheme [25] using m generators, denoted Okamotoλm , is secure 1 against leakage attacks where the allowed leakage is ≈ (1 − m )|sk|, and can be set arbitrarily close to the size of the secret key.

1 ([9]). If Y has 2r possible values and Z is any random variable, then H∞ (X|(Y, Z)) ≥ H∞ (X|Z) − r. A main tool in our constructions in this paper is a strong randomness extractor. 2 ([9]). A function Ext : {0, 1}n ×{0, 1}t → {0, 1}m is an averagecase (k, )-strong extractor if for all pairs of random variables (X, I) such that X ∈ {0, 1}n and H∞ (X|I) ≥ k it holds that SD ((Ext(X, S), S, I), (Um , S, I)) ≤ , where S is uniform over {0, 1}t. Dodis et al. proved that any strong extractor is in fact an average-case strong extractor, for an appropriate setting of the parameters.

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Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009. Proceedings by Nadia Heninger, Hovav Shacham (auth.), Shai Halevi (eds.)


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