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

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

These are the lawsuits of Eurocrypt 2004, the twenty third Annual Eurocrypt C- ference. The convention used to be prepared via contributors of the IBM Zurich examine Laboratory in cooperation with IACR, the foreign organization for Cr- tologic study. Theconferencereceivedarecordnumberof206submissions,outofwhichthe application committee chosen 36 for presentation on the convention (three papers have been withdrawn via the authors presently after submission). those court cases comprise revised models of the accredited papers. those revisions haven't been checked for correctness, and the authors undergo complete accountability for the contents in their papers. The convention application additionally featured invited talks. The ?rst one was once the 2004 IACR extraordinary Lecture given by way of Whit?eld Di?e. the second one invited speak used to be by way of Ivan Damg? ard who provided “Paradigms for Multiparty Computation. ” the conventional rump consultation with brief casual talks on fresh effects was once chaired by way of Arjen Lenstra. The reviewing procedure used to be a difficult activity, and plenty of stable submissions needed to be rejected. every one paper used to be reviewed independently via at the least 3 contributors of this system committee, and papers co-authored via a member of this system committee have been reviewed by means of not less than six (other) participants. the person reviewing section used to be by means of profound and infrequently vigorous d- cussions in regards to the papers, which contributed much to the standard of the ?nal choice. huge reviews have been despatched to the authors in so much cases.

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Additional resources 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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18] Moni Naor and Benny Pinkas. Oblivious transfer and polynomial evaluation. In Proc. 31st Annual ACM Symposium on Theory of Computing, pages 245–254, Atlanta, Georgia, May 1999. [19] Moni Naor and Benny Pinkas. Efficient oblivious transfer protocols. , January 2001. [20] Pascal Paillier. Public-key cryptosystems based on composite degree residuosity classes. In Advances in Cryptology—EUROCRYPT ’99, pages 223–238, Prague, Czech Republic, May 1999. [21] Pascal Paillier. Trapdooring discrete logarithms on elliptic curves over rings.

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 , . . , ζ αt }. We can convert this to a deterministic finite-state automaton (DFA), with some of the edges labeled with ζ αi .

The user does not learn anything about the structure of the graph, except what is revealed by the secrets at the access points she reached and the edges she traversed. We specify this task as access to a black-box with which the user interacts, giving her credentials at various points and receiving the secrets; the black-box internally maintains the current access point of the user. But we would like to implement this task 32 Benjamin Lynn, Manoj Prabhakaran, and Amit Sahai as a program which we then hand over to the user.

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