By Mihir Bellare, Dennis Hofheinz, Scott Yilek (auth.), Antoine Joux (eds.)
This booklet constitutes the refereed complaints of the twenty eighth Annual foreign convention at the idea and functions of Cryptographic strategies, 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 examine points of cryptology, cryptography, and cryptanalysis in addition to complicated purposes. The papers are geared up in topical sections on defense, proofs, and types, hash cryptanalysis, staff and broadcast encryption, cryptosystems, cryptanalysis, part channels, curves, and randomness.
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
By the concurrent zero-knowledge property of IP, such an S ∗ exists and yields indistinguishable experiment outputs. Note that S ∗ does not need witnesses to generate valid-looking proofs, but instead uses (possibly rewinding or even nonblack-box) access to A. Hence, we can substitute all ZKCom-commitments with inconsistent commitments of the form (com 0 , com 1 ), where com 0 and com 1 are Comb -commitments to diﬀerent bits. Such a ZKCom-commitment can later be opened arbitrarily. By the computational hiding property of Comb (and since we do not need witnesses to generate consistency proofs anymore), this step does not change the output distribution of the experiment signiﬁcantly.
Stateless breaking oracles. In our impossibility results, we will describe a computational world with a number of oracles. For instance, there will be a “breaking oracle” B, such that B aids in breaking the SEM-SO-COM security of any given commitment scheme, and in nothing more. To this end, B takes the role of the adversary in the SEM-SO-COM experiment. Namely, B expects to receive a number of commitments, then chooses a subset of these commitments, and then expects openings of the commitments in this subset.
30]). However, if we assume the existence of (families of) collision-resistant hash functions, then even constant-round statistically hiding commitment schemes exist (Damgard et al. , Naor and Yung ). Interactive argument systems and zero-knowledge. We recall some basic deﬁnitions concerning interactive argument systems, mostly following Goldreich . Deﬁnition 5 (Interactive proof/argument system). An interactive proof system for a language L with witness relation R is a pair of PPT machines IP = (P, V) such that the following holds: Completeness.