Download e-book for iPad: 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.)

ISBN-10: 3540424563

ISBN-13: 9783540424567

ISBN-10: 3540446478

ISBN-13: 9783540446477

Crypto 2001, the twenty first Annual Crypto convention, used to be subsidized via the Int- nationwide organization for Cryptologic examine (IACR) in cooperation with the IEEE computing device Society Technical Committee on safeguard and privateness and the pc technological know-how division of the college of California at Santa Barbara. The convention obtained 156 submissions, of which this system committee chosen 34 for presentation; one used to be later withdrawn. those complaints comprise 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 info processing in semiconductors: an experimentalist’s view." Daniel Weitzner spoke on, \Privacy, Authentication & identification: a up to date background of cryptographic struggles for freedom." The convention application additionally integrated 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 lifestyles 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 amassed extra bills than i will ever desire to pay off. As mere statements of thank you are definitely insu cient, reflect on the remainder of this preface my model of bankruptcy 11.

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

Example text

Theorem statement. In its general form, the composition theorem basically says that if ρ securely realizes F then an execution of the composed protocol π ρ “emulates” an execution of protocol π in the F-hybrid model. That is, for any real-life adversary A there exists an adversary H in the F-hybrid model such that no environment machine Z can tell with non-negligible probability whether it is interacting with A and π ρ in the real-life model or it is interacting with H and π in the F-hybrid model..

The general composition theorem now implies that running (multiple copies of) a uc commitment protocol π is essentially equivalent to interacting with the Universally Composable Commitments 23 same number of copies of Fcom , regardless of what the calling protocol does. In particular, the calling protocol may run other commitment protocols and may use the committed values in any way. As mentioned above, this implies a strong version of non-malleability, security under concurrent composition, resilience to selective decommitment, and more.

Then we construct a new environment Z and a new real-life adversary A for which there is no appropriate ideal-model adversary for π. This time, A corrupts the receiver Pj at the beginning. During the execution A obtains messages form the honest committer Pi and feeds these messages into a virtual copy of S. The answers of S, made on behalf of an honest receiver, are forwarded to Pi in the name of the corrupted party Pj . At some point, S creates a submission (Commit, sid, Pi , Pj , b ) to Fcom ; the adversary A outputs b and halts.

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Advances in Cryptology — CRYPTO 2001: 21st Annual International Cryptology Conference, Santa Barbara, California, USA, August 19–23, 2001 Proceedings by Boaz Barak, Oded Goldreich, Rusell Impagliazzo, Steven Rudich, Amit Sahai, Salil Vadhan (auth.), Joe Kilian (eds.)


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