New PDF release: Advances in Cryptology - EUROCRYPT 2004: International

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

ISBN-10: 3540219358

ISBN-13: 9783540219354

ISBN-10: 3540246762

ISBN-13: 9783540246763

These are the complaints of Eurocrypt 2004, the twenty third Annual Eurocrypt C- ference. The convention used to be equipped through contributors of the IBM Zurich study 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application committee chosen 36 for presentation on the convention (three papers have been withdrawn by means of the authors presently after submission). those complaints comprise revised models of the authorised 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 used to be the 2004 IACR distinctive Lecture given via Whit?eld Di?e. the second one invited speak used to be through Ivan Damg? ard who offered “Paradigms for Multiparty Computation. ” the normal rump consultation with brief casual talks on contemporary effects used to be chaired by means of Arjen Lenstra. The reviewing strategy was once a hard activity, and lots of strong submissions needed to be rejected. every one paper used to be reviewed independently by way of 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 a minimum of six (other) participants. the person reviewing section used to be by way of profound and occasionally vigorous d- cussions in regards to the papers, which contributed much to the standard of the ?nal choice. large reviews have been despatched to the authors in such a lot 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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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. : Li ∈ C} is. Further First we prove the following lemma, which is the heart of the proof.

If |x| = n there are O(n2t such choices. But by our convention, since ρ is fixed, t is a constant and n2t is still polynomial in n, the size of input to M . For each such guess (β1 , . . ,αt on (β1 , . . , βt ). ,αt returns ⊥ for all choices, M also outputs ⊥. ,αt returns (α1 , . . , αt ) for any choice of (β1 , . . , βt ), then M constructs the complete DFA (replacing the variables ζ αi with αi ) and checks if x is accepted by the DFA. If so, M outputs α1 , . . , αt ; if not it outputs ⊥. ,αt ) , then there is some path in the DFA for ρ which accepts x.

Lt ) In this section we allow ρ to be part of the function (and therefore can have size polynomial in k). We are interested in matching a given string against ρ(L1 , . . , Lt ) without compromising the black-box nature of L1 , . . , 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.

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Advances in Cryptology - EUROCRYPT 2004: International Conference on the Theory and Applications of Cryptographic Techniques, Interlaken, Switzerland, May 2-6, 2004. Proceedings by Michael J. Freedman, Kobbi Nissim, Benny Pinkas (auth.), Christian Cachin, Jan L. Camenisch (eds.)


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