Download e-book for iPad: 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.)

ISBN-10: 3540741429

ISBN-13: 9783540741428

The twenty seventh Annual overseas Cryptology convention was once held in Santa Barbara, California, in August 2007. The convention drew researchers from worldwide who got here to provide 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 provided in addition to one vital invited lecture. each has been rigorously reviewed through the editor to make sure that all papers are exact, effortless to learn, and make a big contribution to the field.

The papers deal with present foundational, theoretical, and examine points of cryptology, cryptography, and cryptanalysis. moreover, readers will become aware of many complex and rising applications.

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

Example text

We are thus faced with a double challenge: first, strengthen the definition, imposing further requirements on the function in order to provide reasonable privacy guarantees. Second, provide protocols implementing the stronger definition for as wide as possible class of search problems. This is the goal we tackle in this work. 1 This Work As discussed above, the outcome of a private algorithm A when run on an instance x should only depend on the set of possible solutions to x. Which further requirements should be imposed on this outcome?

That is, the probability that A returns the same output on two inputs is at least some constant times the resemblance between Pn (x) and Pn (y). 3. If x ≡P y then A(sn , x) = A(sn , y) for all seeds sn . That is, if x and y are equivalent then A always returns the same output on x and on y. If c = 1 in the above Requirement 2, then A(·, ·) is perfect resemblance preserving with respect to P. Unlike Definition 9, in the definition of resemblance preserving algorithms we do not know how to formulate this privacy using an “ideal world”.

Informally, taking the probability over the seed, the outputs of AP on x is indistinguishable from the uniform distribution on Pn (x). 2. There exists a constant c > 0 such that for all x, y ∈ {0, 1}∗ such that |x| = |y| Pr[ A(sn , x) = A(sn , y) ] ≥ c · r(Pn (x), Pn (y)) . The probability is taken over the random choice of sn . That is, the probability that A returns the same output on two inputs is at least some constant times the resemblance between Pn (x) and Pn (y). 3. If x ≡P y then A(sn , x) = A(sn , y) for all seeds sn .

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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.)


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