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 worldwide who got here to offer 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. every one has been rigorously reviewed by means of the editor to make sure that all papers are actual, effortless to learn, and make an enormous contribution to the field.
The papers deal with present foundational, theoretical, and study points of cryptology, cryptography, and cryptanalysis. furthermore, readers will realize 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
Nguyen the Qi ’s follow the path. This gives some bits of the internal state already, and a kind of message modiﬁcation technique to disclose more bits is proposed in . We can learn bits of Qt using related messages where we ﬁx the ﬁrst t words. 1 The IV-Recovery Attack Against MD5 The IV-recovery attack on MD5 is the same as the one presented in . It uses the related-message technique with the pseudo-collision path of de Boer and Bosselaers . Since the diﬀerences are in the IV and not in the message, the IV-recovery needs an oracle that answers whether MD5IV (M ) = MD5IV (M ), instead of the standard oracle that answers whether MD5IV (M ) = MD5IV (M ).
This can be done with nearly the same complexity as unconstrained MD4 collisions (about 4 MD4 computations per collision) using the technique of Leurent . Thus, the cost of the message generation in the composite IVrecovery attack drops from 2106 using the birthday paradox to 290 and becomes negligible in the full attack. 3 MD4 Attack Summary This attack uses the same IV-recovery attack for the inner key and the outer key, with a complexity of 288 online queries and 294 oﬄine computations. We manage to keep the complexity of the composite IV-recovery as low as the basic IVrecovery because we only need to control the hash diﬀerences, and we introduce a trick to generate many messages with a ﬁxed hash diﬀerence.
It is interesting to note that for the last problem, ﬁnding an eﬃcient equivalence protecting algorithm implies P=NP. To summarize, we present two deﬁnitions (suitable for diﬀerent applications), provide technical tools to achieve these deﬁnitions, and identify generic classes, as well as speciﬁc examples, of search problems where our tools can be used to yield private search algorithms with the desired properties. The main conceptual contribution of the paper is in putting forward the need to study private computation of search problems (where a non-private solution is well known), analyzing privacy considerations, and deﬁning equivalence protecting and resemblance preserving algorithms.
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.)