Advances in Cryptology - CRYPTO 2007: 27th Annual by Vivien Dubois, Pierre-Alain Fouque, Adi Shamir, Jacques

By Vivien Dubois, Pierre-Alain Fouque, Adi Shamir, Jacques Stern (auth.), Alfred Menezes (eds.)

The twenty seventh Annual foreign Cryptology convention was once held in Santa Barbara, California, in August 2007. The convention drew researchers from world wide who got here to provide their findings and speak about the most recent advancements within the box. This booklet constitutes the refereed complaints of the conference.

Thirty-three complete papers are provided in addition to one very important invited lecture. each has been rigorously reviewed through the editor to make sure that all papers are actual, effortless to learn, and make a huge contribution to the field.

The papers handle present foundational, theoretical, and learn facets of cryptology, cryptography, and cryptanalysis. additionally, readers will realize many complicated and rising applications.

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Extra info for Advances in Cryptology - CRYPTO 2007: 27th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 19-23, 2007. Proceedings

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Yung, M. ) SCN 2006. LNCS, vol. 4116, pp. 242–256. Springer, Heidelberg (2006) 10. : Message Freedom in MD4 and MD5: Application to APOP Security. In: Biryukov, A. ) FSE. LNCS, Springer, Heidelberg (to appear) 11. : MDx-MAC and Building Fast MACs from Hash Functions. In: Coppersmith, D. ) CRYPTO 1995. LNCS, vol. 963, pp. 1–14. Springer, Heidelberg (1995) 12. : On the Security of Two MAC Algorithms. A. ) EUROCRYPT 1992. LNCS, vol. 658, pp. 19–32. -A. Fouque, G. Q. Nguyen 13. : On the Security of Iterated Message Authentication Codes.

We note that such attacks require an assumption similar to the previous IVrecovery attack. Namely, we assume that for the same message difference Δ, there is no differential paths with better (or comparable) probability, with or without conditions on the IV. To justify this assumption for our HMAC/NMAC-MD4 attack, we have performed experiments which will be explained in Section 4. 3 Subtleties Between the Inner and Outer Keys Although the recovery of the inner key k2 and the outer key k1 both require IV-recovery attacks, we would like to point out subtle differences between the two cases.

1–16 21. : The Second-Preimage Attack on MD4. , Li, Y. ) CANS 2005. LNCS, vol. 3810, pp. 1–12. 1 Improving the MD4 IV-Recovery Reducing the Online Cost First, we can easily lower the number of calls to the NMAC-oracle in the first phase of the IV-recovery. Instead of trying 22 × 282 random message pairs, we will choose the messages more cleverly so that each message belongs to 22 pairs: we first choose 490 bits of the message at random and then use every possibility for the 22 remaining bits. Thus, we only need 283 calls to the oracle instead of 22 × 283 .

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