By Boaz Barak, Oded Goldreich, Rusell Impagliazzo, Steven Rudich, Amit Sahai, Salil Vadhan (auth.), Joe Kilian (eds.)

Crypto 2001, the twenty first Annual Crypto convention, used to be backed through the Int- nationwide organization for Cryptologic study (IACR) in cooperation with the IEEE desktop Society Technical Committee on safety and privateness and the pc technological know-how division of the college of California at Santa Barbara. The convention acquired 156 submissions, of which this system committee chosen 34 for presentation; one used to be later withdrawn. those lawsuits include the revised types of the 33 submissions that have been awarded on the convention. those revisions haven't been checked for correctness, and the authors endure complete accountability for the contents in their papers. The convention application incorporated invited lectures. Mark Sherwin spoke on, \Quantum details processing in semiconductors: an experimentalist’s view." Daniel Weitzner spoke on, \Privacy, Authentication & id: a contemporary heritage of cryptographic struggles for freedom." The convention software additionally integrated its perennial \rump session," chaired through Stuart Haber, that includes brief, casual talks on late{breaking study information. As i attempt to account for the hours of my existence that ?ew o to oblivion, I notice that almost all of my time used to be spent cajoling gifted innocents into spending much more time on my behalf. i've got collected extra money owed than i will be able to ever wish to pay off. As mere statements of thank you are definitely insu cient, think of the remainder of this preface my model of bankruptcy 11.

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Extra resources for Advances in Cryptology — CRYPTO 2001: 21st Annual International Cryptology Conference, Santa Barbara, California, USA, August 19–23, 2001 Proceedings

Example text

As seen below, the behavior of protocols where several copies of the protocol use the same instance of the reference string can be captured using ideal functionalities that represent multiple copies of the protocol within a single copy of the functionality. 2 The Commitment Functionalities We propose ideal functionalities that represent the intuitive “envelope-like” properties of commitment, as sketched in the introduction. Two functionalities are Universally Composable Commitments 29 presented: functionality Fcom that handles a single commitment-decommitment process, and functionality Fmcom that handles multiple such processes..

Damgard. Efficient Concurrent Zero-Knowledge in the Auxiliary String Model. Eurocrypt 00, LNCS, 2000. G. Di Crescenzo, Y. Ishai and R. Ostrovsky, Non-interactive and nonmalleable commitment, 30th STOC, 1998, pp. 141-150. G. Di Crecenzo, J. Katz, R. Ostrovsky and A. Smith. Efficient and Perfectly-Hiding Non-Interactive, Non-Malleable Commitment. Eurocrypt ’01, 2001. Y. Dodis and S. Micali, “Secure Computation”, CRYPTO ’00, 2000. D. Dolev, C. Dwork and M. Naor, Non-malleable cryptography, SIAM.. J.

Then, π and π ρ have essentially the same input/output behavior. In particular, if π securely realizes some ideal functionality G given ideal access to F then π ρ securely realizes G from scratch. To apply this general framework to the case of commitment protocols, we formulate an ideal functionality Fcom that captures the expected behavior of commitment. Universally Composable (uc) commitment protocols are defined to be those that securely realize Fcom . Our formulation of Fcom is a straightforward transcription of the “envelope paradigm”: Fcom first waits to receive a request from some party C to commit to value x for party R.

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