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

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 used to be backed by means of the foreign organization for Cryptologic Research(IACR;seewww.iacr.org),thisyearincooperationwiththeComputer technological know-how division of the college of Aarhus, Denmark. As common Chair, Ivan Damg? ard used to be liable for neighborhood association. TheEurocrypt2005ProgramCommittee(PC)consistedof30internationally popular specialists. Their names and a?liations are indexed on pages VII and VIII of those lawsuits. by way of the November 15, 2004 submission time limit the computer had got a complete of one hundred ninety submissions through the IACR digital Submission Server. the following choice technique was once divided into levels, as traditional. within the overview part each one submission was once conscientiously scrutinized by way of no less than 3 autonomous reviewers, and the assessment reviews, frequently huge, have been devoted to the IACR internet assessment method. those have been taken because the place to begin 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 approach. throughout the complete computer section, which begun in August 2003 with my earliest invites to laptop participants and which persevered till March 2005, greater than a thousand e-mail messages have been communicated. furthermore, the computer acquired a lot preferred the aid 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

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To select another message M0 is only to change the last two words from the previous selected message M0 . So, finding (M0 , M0 ) only needs about one-time single-message modification for the first 14 words. This time can be neglected. For each selected message M0 , it is only needs two-time single-message modifications for the last two words and 7-time multi-message modifications for correcting 7 conditions in the second round, and each multi-message modification only needs about a few step operations, so the total time for both kinds of modifications is not exceeds about two MD5 operations for each selected message.

1 Introduction People know that digital signatures are very important in information security. The security of digital signatures depends on the cryptographic strength of the underlying hash functions. Hash functions also have many other applications in cryptography such as data integrity, group signature, e-cash and many other cryptographic protocols. The use of hash functions in these applications not only ensure the security, but also greatly improve the efficiency. Nowadays, there are two widely used hash functions – MD5 [18] and SHA-1 [12].

B. Yu, Collisions for hash functions MD4, MD5, HAVAL-128 and RIPEMD, rump session of Crypto’04, E-print, 2004. 20. L. Zheng, J. Pieprzyk, J. Seberry. HAVAL–A one-way hashing algorithm with variable length of output, Advances in Cryptology, Auscrypt’92 Proceedings, Springer-Verlag. 32 X. Wang and H. Yu Table 3. The Differential Characteristics in the First Iteration Differential Step 4 5 6 7 The output in i-th step for M0 b1 a2 d2 c2 8 b2 9 a3 10 d3 11 c3 12 b3 13 a4 14 d4 15 c4 16 b4 17 a5 18 d5 19 c5 20 b5 21 a6 22 d6 23 c6 24 b6 25 a7 26 d7 27 c7 ...

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