By Vivien Dubois, Pierre-Alain Fouque, Adi Shamir, Jacques Stern (auth.), Alfred Menezes (eds.)
The twenty seventh Annual foreign Cryptology convention used to be held in Santa Barbara, California, in August 2007. The convention drew researchers from around the globe who got here to give their findings and speak about the most recent advancements within the box. This e-book constitutes the refereed lawsuits of the conference.
Thirty-three complete papers are awarded in addition to one very important invited lecture. every one has been conscientiously reviewed by way of the editor to make sure that all papers are actual, effortless to learn, and make a major contribution to the field.
The papers tackle present foundational, theoretical, and learn facets of cryptology, cryptography, and cryptanalysis. furthermore, readers will become aware of many complicated and rising applications.
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Extra resources for Advances in Cryptology - CRYPTO 2007: 27th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 19-23, 2007. Proceedings
12] – There is no diﬀerence on Q12 . The second condition is required to eliminate the paths which simply keep the  diﬀerence introduced in Q0 without modifying it. We ran this with 5 · 1011 random messages and IVs and found 45624 collisions out of which 45515 respected the condition: this gives a ratio of about 420. This does not prove that we will have such a bias for collisions in the full MD4, but it is a strong evidence. The same arguments apply when we introduce the message diﬀerence in an[k s ] [k s ] other bit k (ie.
In the attack on HMAC/NMAC-MD4, we will exploit the Merkle-Damg˚ ard structure of Hk2 to eﬃciently extend the basic IV-recovery attacks into composite IV-recovery attacks. We will present two types of IV-recovery attacks. The ﬁrst type is due to Contini and Yin  and uses related messages, while the second type is novel, based on IV-dependent diﬀerential paths. Using related messages. We present the ﬁrst type of IV-recovery attacks. Assume that we know a speciﬁc diﬀerential path corresponding to a message diﬀerence Δ and with total probability p much larger than 2−128 .
Nguyen it works on bit positions 0, 1, 3, 4, 6-8, 12-17, 19-24, 26, 27, and 29, and fails on other positions due to carry expansions. This path was found using an automated diﬀerential paths search algorithm described in . 23] ¸  ˙  ¸ ˙  ¸ ˙ [29,30] ˙  ¸ ¸              Q15 = Q13 , Q15 = Q13 , Q15 = Q13       Q16 = Q15 , Q16 = Q15 , Q16 = Q15 Q17  Q19  Q20  Q21  Q22  Q23  Q23  Q25  Q26   = Q16 ,  = Q17 ,  = Q19 ,  = Q19  = Q21 ,  = Q21  = Q22  = Q23 ,  = Q25 ,   Q17 = Q16 , Q17 = Q16 , Q17 = Q16       Q19 = Q17 , Q19 = Q17 , Q19 = Q17         Q20 = Q19 , Q20 = Q19 , Q20 = Q19 , Q19 = Q18 Q21 = Q20 Q25 = Q23   Q26 = Q25  Q27 = Q26   Q29 = Q27   Q30 = Q29 Path 1.
Advances in Cryptology - CRYPTO 2007: 27th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 19-23, 2007. Proceedings by Vivien Dubois, Pierre-Alain Fouque, Adi Shamir, Jacques Stern (auth.), Alfred Menezes (eds.)