Get Advances in Cryptology — EUROCRYPT ’90: Workshop on the PDF

By Mike V. D. Burmester, Yvo Desmedt (auth.), Ivan Bjerre Damgård (eds.)

ISBN-10: 3540468773

ISBN-13: 9783540468776

ISBN-10: 354053587X

ISBN-13: 9783540535874

Eurocrypt is a convention dedicated to all facets of cryptologic learn, either theoretical and useful, backed by means of the foreign organization for Cryptologic learn (IACR). Eurocrypt ninety happened in Åarhus, Denmark, in might 1990. From the eighty five papers submitted, forty two have been chosen for presentation on the convention and for inclusion during this quantity. as well as the formal contributions, brief abstracts of a few casual talks are incorporated in those complaints. The lawsuits are equipped into classes on protocols, number-theoretic algorithms, boolean capabilities, binary sequences, implementations, combinatorial schemes, cryptanalysis, new cryptosystems, signatures and authentication, and impromptu talks.

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Extra resources for Advances in Cryptology — EUROCRYPT ’90: Workshop on the Theory and Application of Cryptographic Techniques Aarhus, Denmark, May 21–24, 1990 Proceedings

Sample text

In this case Bob can study Aand B for years but he will never know (without the cooperation of Alice) so if according to the protocol Bob did not receive the message he will not find it by any deviation of the protocol. So Bob can,after committing to a good modulus and non-square residue, never fmd out the message bit if the pduct of the two residues is a non-square. So indeed secrecy is almost unconditionally protected. On the other h d if Alice can distinguish between squares and non-squares (thusviolating Q .

In other words breaking the cryptographic assumption) she catl for example always sends a message which never arrives. She does this by observing the quadtatic chamcteristic of Res and choosing d zero if Res is a non-square and choosing done if Res is a square. ) pair zero and one to Bob. So indeed the authenticity is protected by the cryptographic assumption. The extra factor J which Alice can use (she can take Res J or Res as product 40 for the residues A and B ) is to protect her against an m m p t to cheat by Bob by making all Res a square.

All is needed is the availability of a. common random reference string, whose length does not depend on the number of users, but only on the desired level of security. Oblivious Transfer 4 Oblivious Transfer has btyn introduced by Rabin (see [HR]), who first gave an implemcntation (for honest players) based on the difficulty of factoring. OT is a protocol for two parties: thc Ssiider who has a string s, and the Receiver. Each of the following two events is equally likely to occur at the end of the protocol.

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Advances in Cryptology — EUROCRYPT ’90: Workshop on the Theory and Application of Cryptographic Techniques Aarhus, Denmark, May 21–24, 1990 Proceedings by Mike V. D. Burmester, Yvo Desmedt (auth.), Ivan Bjerre Damgård (eds.)


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