Download Advances in Cryptology – EUROCRYPT 2005: 24th Annual by Xiaoyun Wang, Xuejia Lai, Dengguo Feng, Hui Chen, Xiuyuan Yu PDF

By Xiaoyun Wang, Xuejia Lai, Dengguo Feng, Hui Chen, Xiuyuan Yu (auth.), Ronald Cramer (eds.)

These are the complaints of the twenty fourth Annual IACR Eurocrypt convention. The convention used to be subsidized through the overseas organization for Cryptologic Research(IACR;,thisyearincooperationwiththeComputer technology division of the collage of Aarhus, Denmark. As normal Chair, Ivan Damg? ard was once accountable for neighborhood association. TheEurocrypt2005ProgramCommittee(PC)consistedof30internationally well known specialists. Their names and a?liations are indexed on pages VII and VIII of those complaints. by means of the November 15, 2004 submission closing date the computer had got a complete of one hundred ninety submissions through the IACR digital Submission Server. the next choice technique used to be divided into levels, as traditional. within the evaluate section each one submission used to be rigorously scrutinized by means of a minimum of 3 self sufficient reviewers, and the overview reviews, usually large, have been devoted to the IACR internet assessment procedure. those have been taken because the place to begin for the PC-wideWeb-baseddiscussionphase.Duringthisphase,additionalreportswere supplied as wanted, and the computer finally had a few seven-hundred stories at its disposal. furthermore, the discussions generated greater than 850 messages, all published within the method. through the whole notebook part, which all started in August 2003 with my earliest invites to notebook individuals and which endured until eventually March 2005, greater than a thousand e-mail messages have been communicated. furthermore, the computer got a lot favored the aid of a wide physique of exterior reviewers. Their names are indexed on web page VIII of those proceedings.

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Additional info for Advances in Cryptology – EUROCRYPT 2005: 24th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Aarhus, Denmark, May 22-26, 2005. Proceedings

Sample text

In the next update formula, it will also propagate, again on bit 31. After that round, the initial difference has vanished and no longer propagates. Now, consider that state 3 enters the real SHA-0. Then, in the first formula, both D and E have a difference on bit 31, however, depending on the result of the IF function the difference on D may either propagate or not. More precisely, if bit 31 of register B (which is the same in both messages) is a 1, the difference on D does not propagate. On the other hand, the difference on E always propagates.

They take messages of any length (up to 264 bits) and compute 160-bit hash values. At CRYPTO’98 Chabaud and Joux [2] proposed a theoretical attack on the full SHA-0 with a complexity of 261 . It is a differential attack that uses a weakness of the expansion algorithm of SHA-0. Their attack is faster than the generic birthday paradox attack and partially explain the withdrawal of SHA-0 by NSA. It is interesting to note that they count the complexity in term of the number of message pairs to be tried and not in term of the number of SHA-0 calls.

In parallel to this paper, Rijmen and Oswald also recently studies reduced versions of SHA-1 [9]. This paper is organized as follows: In Section 2 we describe how near-collisions can be used to find collisions by a multi-block technique. In section 3, we show how the multi-block technique can be refined in order to work on the full SHA-0, this leads to a full collision on SHA-0 using messages of four blocks. In Section 4 we describe how the attack on SHA-0 is expanded to attack SHA-1. This section presents various attacks on reduced versions of SHA-1, where each attack emphasizes different aspects and techniques.

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