By Xiaoyun Wang, Xuejia Lai, Dengguo Feng, Hui Chen, Xiuyuan Yu (auth.), Ronald Cramer (eds.)
These are the court cases of the twenty fourth Annual IACR Eurocrypt convention. The convention was once backed via the foreign organization for Cryptologic Research(IACR;seewww.iacr.org),thisyearincooperationwiththeComputer technology division of the collage of Aarhus, Denmark. As basic Chair, Ivan Damg? ard used to be accountable for neighborhood association. TheEurocrypt2005ProgramCommittee(PC)consistedof30internationally popular specialists. Their names and a?liations are indexed on pages VII and VIII of those complaints. via the November 15, 2004 submission cut-off date the computer had obtained a complete of one hundred ninety submissions through the IACR digital Submission Server. the following choice procedure was once divided into stages, as ordinary. within the overview section every one submission was once rigorously scrutinized through at the least 3 autonomous reviewers, and the evaluate stories, usually vast, have been dedicated to the IACR internet evaluate method. those have been taken because the start line for the PC-wideWeb-baseddiscussionphase.Duringthisphase,additionalreportswere supplied as wanted, and the computer ultimately had a few seven hundred experiences at its disposal. additionally, the discussions generated greater than 850 messages, all published within the procedure. in the course of the whole notebook part, which began in August 2003 with my earliest invites to computer participants and which endured until eventually March 2005, greater than a thousand e mail messages have been communicated. additionally, the computer obtained a lot liked the help of a wide physique of exterior reviewers. Their names are indexed on web page VIII of those proceedings.
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Extra 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
215 231 231 231 231 231 231 231 ... 231 231 231 231 231 ... 231 231 231 −215 The output in i-th step for M1 aa0 , dd0 [26, 32] cc0 [−26, 27, 32], bb0 [26, −32] a1 [26, −32] d1 [6, 26, −32] c1 [−6, −7, 8, −12, 13, -17,. . ,-21,22,-26,. . ,-30,31,-32] b1 [2, 3, 4, −5, 6, −26, 27, −32] a2 [1, −7, 8, 9, −10, −11, −12, 13, 32] d2 [17, −18, 21, −22, 32] c2 [7, 8, 9, −10, 28, −29, −32] b2 [−16, 17, −18, 24, 25, 26, −27, −32] a3 [−1, 2, −7, −8, −9, 10, −32] d3 [13, −32] c3 [−32] b3 [−8, 14, 15, 16, 17, 18, 19, −20, −32] a4 [−25, .
5 Summary In this paper we described a powerful attack against hash functions, and in particular showed that ﬁnding a collision of MD5 is easily feasible. Our attack is also able to break eﬃciently other hash functions, such as HAVAL-128, MD4, RIPEMD, and SHA-0. The analysis results for these hash functions are as follows: 1. The time complexity for ﬁnding a collision for MD4 is about 223 MD4 operations without the multi-message modiﬁcation, and is about 28 MD4 operations with the multi-message modiﬁcation.
We select a collision diﬀerential with two iterations as follows: ΔH0 (M0 ,M0 ) −→ ΔH1 (M1 ,M1 ) −→ ΔH = 0 where ΔM0 = M0 − M0 = (0, 0, 0, 0, 231 , 0, 0, 0, 0, 0, 0, 215 , 0, 0, 231 , 0) ΔM1 = M1 − M1 = (0, 0, 0, 0, 231 , 0, 0, 0, 0, 0, 0, −215 , 0, 0, 231 , 0) ΔH1 = (231 , 231 + 225 , 231 + 225 , 231 + 225 ). Non-zero entries of ΔM0 and ΔM1 are located at positions 5, 12 and 15. ΔH1 = (Δa, Δb, Δc, Δd) is the diﬀerence of the four chaining values (a, d, c, b) after the ﬁrst iteration. We select ΔM0 to ensure that both 3-4 round diﬀerential happens with a high probability.
Advances in Cryptology – EUROCRYPT 2005: 24th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Aarhus, Denmark, May 22-26, 2005. Proceedings by Xiaoyun Wang, Xuejia Lai, Dengguo Feng, Hui Chen, Xiuyuan Yu (auth.), Ronald Cramer (eds.)