Advances in Cryptology - EUROCRYPT 2004: International by Michael J. Freedman, Kobbi Nissim, Benny Pinkas (auth.),

By Michael J. Freedman, Kobbi Nissim, Benny Pinkas (auth.), Christian Cachin, Jan L. Camenisch (eds.)

These are the court cases of Eurocrypt 2004, the twenty third Annual Eurocrypt C- ference. The convention used to be geared up by means of contributors of the IBM Zurich learn Laboratory in cooperation with IACR, the foreign organization for Cr- tologic learn. Theconferencereceivedarecordnumberof206submissions,outofwhichthe software committee chosen 36 for presentation on the convention (three papers have been withdrawn by means of the authors almost immediately after submission). those court cases comprise revised types of the authorised papers. those revisions haven't been checked for correctness, and the authors endure complete accountability for the contents in their papers. The convention software additionally featured invited talks. The ?rst one was once the 2004 IACR unique Lecture given via Whit?eld Di?e. the second one invited speak was once via Ivan Damg? ard who offered “Paradigms for Multiparty Computation. ” the normal rump consultation with brief casual talks on contemporary effects used to be chaired via Arjen Lenstra. The reviewing method was once a demanding job, and lots of sturdy submissions needed to be rejected. every one paper used to be reviewed independently via a minimum of 3 participants of this system committee, and papers co-authored through a member of this system committee have been reviewed by means of at the least six (other) participants. the person reviewing section was once by way of profound and infrequently full of life d- cussions in regards to the papers, which contributed much to the standard of the ?nal choice. wide reviews have been despatched to the authors in such a lot cases.

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Extra info for Advances in Cryptology - EUROCRYPT 2004: International Conference on the Theory and Applications of Cryptographic Techniques, Interlaken, Switzerland, May 2-6, 2004. Proceedings

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We ask if obfuscations of composed functions can be obtained by using obfuscations of the component functions. In particular we look at function compositions (in the usual mathematical sense, of one function invoking another). Conjecture 2. Conjecture on Obfuscatability of Function Compositions: Given two classes F and G of obfuscatable programs, the family A = {A(x) = F (G(x)) : F ∈ F , G ∈ G } is obfuscatable. Theorem 1. The Conjecture on Obfuscatability of Function Compositions is false, if factoring Blum integers is hard or the DDH assumption is true.

Secure multiparty computation of approximations. In Automata Languages and Programming: 27th International Colloquim (ICALP 2001), pages 927–938, Crete, Greece, July 2001. [11] Oded Goldreich. Secure multi-party computation. edu/cryptolib/BOOKS, 1999. [12] Bernardo A. Huberman, Matt Franklin, and Tad Hogg. Enhancing privacy and trust in electronic communities. In Proc. ACM Conference on Electronic Commerce, pages 78–86, Denver, Colorado, November 1999. [13] Russell Impagliazzo and Steven Rudich.

T ; else return ⊥. ,αt : αi ∈ ∪kj=0 {0, 1}j }, and Uρ = ∪k Uρ k . ,αt reveals nothing beyond the fact that the string is not in the language. We show that this function can be completely obfuscated. Theorem 4. For any regular expression ρ, the family Uρ is efficiently obfuscatable in the random oracle model. Vρ . To prove this, we introduce another family of functions Vρ , and show that Uρ Then, we show that Vρ can be obfuscated (in the random oracle model). Recall that ρ is a regular expression over the symbols Σ ∪ {ζ α1 , .

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