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

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

The twenty seventh Annual overseas Cryptology convention was once held in Santa Barbara, California, in August 2007. The convention drew researchers from all over the world who got here to give their findings and talk about the most recent advancements within the box. This ebook constitutes the refereed complaints of the conference.

Thirty-three complete papers are provided in addition to one vital invited lecture. every one has been conscientiously reviewed through the editor to make sure that all papers are actual, effortless to learn, and make a major contribution to the field.

The papers handle present foundational, theoretical, and learn features of cryptology, cryptography, and cryptanalysis. moreover, readers will observe many complicated and rising applications.

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

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Definition 5 (Seeded Algorithms). A seeded algorithm A is a deterministic polynomial time algorithm taking two inputs x, sn where |x| = n and |sn | = p(n) for some polynomial p(). The distribution induced by a seeded algorithm on an input x is the distribution on outcomes A(x, sn ) where sn is chosen uniformly at random from {0, 1}p(|x|). , A(x, sn ) = A(y, sn ) for all sn ∈ {0, 1}p(|x|) whenever x ≡P y. How Should We Solve Search Problems Privately? 3 37 Equivalence Protecting Privacy Definition In this section we suggest a definition of private algorithm for a search problem and supply efficient algorithms satisfying this definition for a broad class of problems.

Efficient Collision Search Attacks on SHA-0. [16] pp. 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.

An oracle that is private with respect to P represents one possible functionality that solves the search problem and protects the equivalence relation. We define an algorithm to be equivalence protecting if it cannot be efficiently distinguished from a random oracle that is private with respect to P. Definition 7 (Equivalence Protecting Algorithm). Let P = {Pn }n∈N be a search problem. An algorithm A(·, ·) is private with respect to ≡P , if for every polynomial time oracle machine D, for every polynomial p, and for all sufficiently large n’s, 1 Pr[DOn (1n ) = 1] − Pr[DA(·,sn ) (1n ) = 1] < , p(n) where the first probability is over the uniform distribution over oracles On that are private with respect to P, and the second probability is uniform over the choices of the seed sn for the algorithm A.

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