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 court cases of Eurocrypt 2004, the twenty third Annual Eurocrypt C- ference. The convention used to be prepared by way of participants of the IBM Zurich learn Laboratory in cooperation with IACR, the overseas organization for Cr- tologic learn. Theconferencereceivedarecordnumberof206submissions,outofwhichthe software committee chosen 36 for presentation on the convention (three papers have been withdrawn via the authors almost immediately after submission). those court cases comprise revised types of the authorized 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 unusual Lecture given by means of Whit?eld Di?e. the second one invited speak was once through Ivan Damg? ard who awarded “Paradigms for Multiparty Computation. ” the conventional rump consultation with brief casual talks on fresh effects was once chaired via Arjen Lenstra. The reviewing approach used to be a difficult job, and plenty of solid submissions needed to be rejected. each one paper used to be reviewed independently via a minimum of 3 individuals of this system committee, and papers co-authored by way of a member of this system committee have been reviewed by way of at the very least six (other) participants. the person reviewing part was once by means of profound and occasionally energetic 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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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

Example text

If so return α1 , . . , αt ; else return ⊥. ,αt : αi ∈ ∪kj=0 {0, 1}j }, and Vρ = ∪k Vρ k . Lemma 7. Uρ Vρ for all regular expressions ρ. ,αt ∈ Vρ . ,αt : As input M Vρ receives a ∗ string x ∈ {0, 1} . ,αt ) . M chooses t substrings of x as guesses for α1 , . . , αt . 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 ⊥.

We are hopeful our reduction and composition Positive Results and Techniques for Obfuscation 39 techniques will aid in resolving these problems. The most pressing open problem is to extend our positive results beyond what we have. In particular, can regular languages be obfuscated? Is there any example of a keyed cryptographic primitive (even a contrived one) other than password checking which can be obfuscated? Another important problem to be resolved is to find any non-trivial obfuscation result without using the random oracle model.

Ft is defined as follows: F1 , . . , Ft (i, x) = Fi (x) if i ∈ {1, . . , t}; else ⊥ Let O(F ), O(G) , by abuse of notation stands for the code which consists of the codes O(F ) and O(G) as modules, and a small driving unit which directs the calls to one of the modules as appropriate. Definition 6. (Simply Composing Obfuscations) An obfuscator O for a family F is said to produce simply t-self-composing obfuscations if O∗ ( F1 , . . , Ft ) = O(F1 ), . . , O(Ft ) is an obfuscation of the family { F1 , .

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