Advances in Cryptology - EUROCRYPT 2007: 26th Annual by Marc Stevens, Arjen Lenstra, Benne de Weger (auth.), Moni

By Marc Stevens, Arjen Lenstra, Benne de Weger (auth.), Moni Naor (eds.)

Those are the court cases of Eurocrypt 2007, the twenty sixth Annual IACR EurocryptConference. The convention was once subsidized by way of the foreign organization forCryptologic examine (IACR; see, this yr in cooperation withthe learn team on arithmetic utilized to Cryptography at UPC and theResearch workforce on details safety at UMA. The Eurocrypt 2007 ProgramCommittee (PC) consisted of 24 participants whose names are indexed at the nextpage.The laptop selected a number of guidelines: 0 workstation papers - no software Committeemember might put up papers; not obligatory anonymity - authors may well pick out toanonymize their papers or now not. nameless papers have been handled as traditional, i.e.,the author’s identification used to be now not printed to the computer. The submission software program usedwas “Web Submission and overview software program” written and maintained through ShaiHalevi. there have been 173 papers submitted to the convention and the computer chose33 of them. every one paper used to be assigned to no less than 3 computer individuals, who eitherhandled it themselves or assigned it to an exterior referee. After the reports weresubmitted, the committee deliberated either on-line for numerous weeks and finallyin a face-to-face assembly held in Paris. as well as notification of the decisionof the committee, authors got experiences. Our objective was once to supply meaningfulcomments to authors of all papers (both these chosen for this system andthose now not selected). The default for any file given to the committee was once thatit might be on hand to the authors in addition.

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Extra resources for Advances in Cryptology - EUROCRYPT 2007: 26th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Barcelona, Spain, May 20-24, 2007. Proceedings

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In these configurations, pairs of queries from the bottom row that do not both contain a ‘1’ or both contain a ‘0’ (namely, queries with different labels) are presumed different; there are no constraints relating top row to bottom row queries, and queries with the same label are not presumed equal (see Fig. 4 for an explanation of “top row”, “bottom row”). The predicates ExistsFit5 (Q), ExistsFit8 (Q) then denote the existence of a set of queries in Q fitting respectively configurations 5 and 8 under these constraints.

In STOC, pages 387–394, 1990. 17. Daniel R. Simon. Finding collisions on a one-way street: Can secure hash functions be based on general assumptions? In EUROCRYPT, pages 334–345, 1998. 18. Xiaoyun Wang, Yiqun Lisa Yin, and Hongbo Yu. Finding collisions in the full sha-1. In CRYPTO, pages 17–36, 2005. 19. Xiaoyun Wang and Hongbo Yu. How to break md5 and other hash functions. In EUROCRYPT, pages 19–35, 2005. The Collision Intractability of MDC-2 in the Ideal-Cipher Model John P. Steinberger Dept.

Therefore we can assume (by symmetry) that query 1BL is not equal to query 2L but that query 1BR equals query 2R. But then ExistsFit4a (Q). This concludes the case when the adversary’s collision is of type (ii). We now assume that both of the words involved in the collision have at least two rounds. We examine the last two rounds of the hashing of each word; the queries for these last two rounds are labeled as in Fig. 4. By the same remark as above, the same query cannot appear in both left and right positions at the same round of the same word, so the top row constraints of configuration 8 are satisfied.

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