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Download Advances in Cryptology - EUROCRYPT 2009: 28th Annual by Mihir Bellare, Dennis Hofheinz, Scott Yilek (auth.), Antoine PDF

By Mihir Bellare, Dennis Hofheinz, Scott Yilek (auth.), Antoine Joux (eds.)

This booklet constitutes the refereed court cases of the twenty eighth Annual foreign convention at the concept and purposes of Cryptographic suggestions, EUROCRYPT 2009, held in Cologne, Germany, in April 2009.

The 33 revised complete papers awarded including 1 invited lecture have been rigorously reviewed and chosen from 148 submissions. The papers handle all present foundational, theoretical and learn elements of cryptology, cryptography, and cryptanalysis in addition to complicated functions. The papers are geared up in topical sections on safety, proofs, and types, hash cryptanalysis, staff and broadcast encryption, cryptosystems, cryptanalysis, aspect channels, curves, and randomness.

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Read Online or Download Advances in Cryptology - EUROCRYPT 2009: 28th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Cologne, Germany, April 26-30, 2009. Proceedings PDF

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Additional info for Advances in Cryptology - EUROCRYPT 2009: 28th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Cologne, Germany, April 26-30, 2009. Proceedings

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Indeed, B needs to check that for all syntactically possible commitments and decommitments, and all possible 9 Examples of such X are random oracles or ideal ciphers. It will become clearer how we use the EXPSPACE requirement in the proof. 30 M. Bellare, D. Hofheinz, and S. Yilek random coins used by X , the opened message is unique. Hence, by assumption about X , this test can also be performed by A using an EXPSPACE-oracle, and the above proof idea applies. On the requirement on X . We stress that the requirement in Theorem 5 on X is a rather mild one.

26 M. Bellare, D. Hofheinz, and S. Yilek constructed from one-way permutations. To ease presentation, we only describe a bit commitment scheme, which is easily extended (along with the proof) to the multi-bit case. 7 In the opening phase, the sender opens one (randomly selected) commitment. Note that this overall commitment scheme is binding, since IP ensures that both commitments contain the same bits, and the underlying commitment Comb is binding. For a SEM-SO-COM simulation, we generate inconsistent overall commitments which can later be opened arbitrarily by choosing which individual Comb -commitment is opened.

The relation between SEM-SO-COM and IND-SO-COM security. Unfortunately, we (currently) cannot prove that SEM-SO-COM security implies IND-SO-COM security (although this seems plausible, since usually simulationbased definitions imply their indistinguishability-based counterparts). Technically, the reason why we are unable to prove an implication is the conditioned distribution M | m[I] in the ideal IND-SO-COM experiment, which cannot be sampled from during an (efficient) reduction. Possibility and Impossibility Results for Encryption and Commitment 29 A relaxation.

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