Advances in Cryptology — CRYPTO 2001: 21st Annual by Boaz Barak, Oded Goldreich, Rusell Impagliazzo, Steven

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 via the Int- nationwide organization for Cryptologic examine (IACR) in cooperation with the IEEE computing device Society Technical Committee on protection and privateness and the pc technological know-how division of the college of California at Santa Barbara. The convention got 156 submissions, of which this system committee chosen 34 for presentation; one used to be later withdrawn. those lawsuits comprise the revised models 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 software incorporated invited lectures. Mark Sherwin spoke on, \Quantum details processing in semiconductors: an experimentalist’s view." Daniel Weitzner spoke on, \Privacy, Authentication & id: a up to date heritage of cryptographic struggles for freedom." The convention software additionally incorporated its perennial \rump session," chaired by way of Stuart Haber, that includes brief, casual talks on late{breaking examine information. As i attempt to account for the hours of my existence that ?ew o to oblivion, I become aware of that almost all of my time was once spent cajoling gifted innocents into spending much more time on my behalf. i've got accrued extra bills than i will be able to ever wish to pay off. As mere statements of thank you are definitely insu cient, think about the remainder of this preface my model of bankruptcy 11.

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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 via the Int- nationwide organization for Cryptologic examine (IACR) in cooperation with the IEEE computing device Society Technical Committee on protection and privateness and the pc technological know-how division of the college of California at Santa Barbara. The convention got 156 submissions, of which this system committee chosen 34 for presentation; one used to be later withdrawn. those lawsuits comprise the revised models 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 software incorporated invited lectures. Mark Sherwin spoke on, \Quantum details processing in semiconductors: an experimentalist’s view." Daniel Weitzner spoke on, \Privacy, Authentication & id: a up to date heritage of cryptographic struggles for freedom." The convention software additionally incorporated its perennial \rump session," chaired by way of Stuart Haber, that includes brief, casual talks on late{breaking examine information. As i attempt to account for the hours of my existence that ?ew o to oblivion, I become aware of that almost all of my time was once spent cajoling gifted innocents into spending much more time on my behalf. i've got accrued extra bills than i will be able to ever wish to pay off. As mere statements of thank you are definitely insu cient, think about the remainder of this preface my model of bankruptcy 11.

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

Sample text

It is based on the equivocable bit commitment scheme of Di Crescenzo et al. [dio98], which in turn is a clever modification of Naor’s commitment scheme [n91]. Let G be a pseudorandom generator stretching n-bit inputs to 4n-bit outputs. For security parameter n the receiver in [n91] sends a random 4n-bit string σ to n the sender, who picks a random r ∈ {0, 1} , computes G(r) and returns G(r) or G(r) ⊕ σ to commit to 0 and 1, respectively. To decommit, the sender transmits b and r. By the pseudorandomness of G the receiver cannot distinguish both cases, and with probability 2−2n over the choice of σ it is impossible to find openings r0 and r1 such that G(r0 ) = G(r1 ) ⊕ σ.

2, 2000, pp. 391-437. Preliminary version in 23rd Symposium on Theory of Computing (STOC), ACM, 1991. C. Dwork, M. Naor, O. Reingold, and L. Stockmeyer. Magic functions. In 40th Annual Symposium on Foundations of Computer Science, pages 523–534. IEEE, 1999. U. Feige and A. Shamir. Witness Indistinguishability and Witness Hiding Protocols. In 22nd STOC, pages 416–426, 1990. M. Fischlin and R. Fischlin, “Efficient non-malleable commitment schemes”, CRYPTO ’00, LNCS 1880, 2000, pp. 413-428. Z. Galil, S.

The ideal process is modified as follows. In a preliminary step, the idealmodel adversary chooses a string in some arbitrary way and writes this string on the input tape of the environment machine. After this initial step the computation proceeds as before. It is stressed that the ideal functionality has no access to the reference string. Justification of the crs model. , the simulator) to choose the reference string is justified by the fact that the behavior of the ideal functionality does not depend on the reference string.

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