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 lawsuits 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 study Laboratory in cooperation with IACR, the foreign organization for Cr- tologic examine. Theconferencereceivedarecordnumberof206submissions,outofwhichthe software committee chosen 36 for presentation on the convention (three papers have been withdrawn via the authors almost immediately after submission). those complaints comprise revised types of the accredited 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 used to be the 2004 IACR exceptional Lecture given through Whit?eld Di?e. the second one invited speak used to be via Ivan Damg? ard who provided “Paradigms for Multiparty Computation. ” the normal rump consultation with brief casual talks on fresh effects used to be chaired by means of Arjen Lenstra. The reviewing procedure used to be a demanding job, and plenty of solid submissions needed to be rejected. each one paper was once reviewed independently through at the least 3 contributors of this system committee, and papers co-authored through a member of this system committee have been reviewed by means of not less than six (other) individuals. the person reviewing part was once through profound and infrequently energetic d- cussions in regards to the papers, which contributed much to the standard of the ?nal choice. vast 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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Lt . The family of functions we are interested in is FC below. ,Lt Definition 16. ,Lt GL (a, x) = L (x) if a ∈ {2, . . , t + 1} a−1 ρ ⎪ ⎩ ⊥ otherwise ⎧ ⎪ if a = 0 and x matches ρ(L1 , . . ,Lt Fρ (a, x) = 0 if a = 0 and x does not match ρ(L1 , . . ,Lt provide access to the languages Li and to ρ (the description of) the regular expression ρ. ,Lt gives access to the language defined by the regular expression ρ(L1 , . . , Lt ). Theorem 5. FC is obfuscatable if and only if { L1 , . . , Lt this statement holds restricted to efficient obfuscations too.

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.

Consider a large organization (such as a government) that wishes to implement a complex hierarchical access control system for a large collection of private information. g. the co-chair of one subcommittee and the secretary of an unrelated working group may need access to the same piece of secret information). In our setting, we allow for an exponential number of sets of credentials to give access to a common piece of information. We model this framework as an arbitrary directed graph, where each edge is labeled with a password/credential, and each node is attached to a secret.

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