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 by way of the Int- nationwide organization for Cryptologic learn (IACR) in cooperation with the IEEE laptop 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The convention obtained 156 submissions, of which this system committee chosen 34 for presentation; one was once later withdrawn. those court cases include the revised models of the 33 submissions that have been provided on the convention. those revisions haven't been checked for correctness, and the authors undergo 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 contemporary background of cryptographic struggles for freedom." The convention software additionally incorporated its perennial \rump session," chaired by means of 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 was once spent cajoling proficient innocents into spending much more time on my behalf. i've got amassed extra bills than i will ever wish to pay off. As mere statements of thank you are definitely insu cient, contemplate 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

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26 R. Canetti and M. Fischlin describing realπ,A,Z (k, z, r) when r is uniformly chosen. Let realπ,A,Z denote the ensemble {realπ,A,Z (k, z)}k∈N,z∈{0,1}∗ . The ideal process. Security of protocols is defined via comparing the protocol execution in the real-life model to an ideal process for carrying out the task at hand. A key ingredient in the ideal process is the ideal functionality that captures the desired functionality, or the specification, of that task. The ideal functionality is modeled as another ITM that interacts with the environment and the adversary via a process described below.

Keywords: Commitment schemes, concurrent composition, nonmalleability, security analysis of protocols. 1 Introduction Commitment is one of the most basic and useful cryptographic primitives. , [gmw87,ghy88,g98]), in contract-signing and electronic commerce, and more. , [n91,ddn00, novy92,b99,dio98,ff00,dkos01]). The basic idea behind the notion of commitment is attractively simple: A committer provides a receiver with the digital equivalent of a “sealed envelope” containing a value x. J. Watson Research Center.

Basically, a claw-free trapdoor permutation pair is a pair of trapdoor permutations with a common range such that it is hard to find two elements that are preimages of the same element under the two permutations. More formally, a key generation KGenclaw outputs a random public key pk claw and a trapdoor td claw . n n The public key defines permutations f0,pk claw , f1,pk claw : {0, 1} → {0, 1} , whereas −1 −1 , f1,pk . It should be inthe secret key describes the inverse functions f0,pk claw claw feasible to find a claw x0 , x1 with f0,pk claw (x0 ) = f1,pk claw (x1 ) given only pk claw .

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