Abritrated Unconditionally Secure Authentication Can Be Unconditionally Protected Against Arbiter's Attacks (Extended Abstract)

  • Authors:
  • Yvo Desmedt;Moti Yung

  • Affiliations:
  • -;-

  • Venue:
  • CRYPTO '90 Proceedings of the 10th Annual International Cryptology Conference on Advances in Cryptology
  • Year:
  • 1990

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Abstract

Given an arbiter whose arbitrage is trusted, an authentication scheme is presented which is unconditionally secure against impersonation and/or substitution attacks performed by the arbiter, whereas previous scheme did not protect against such attacks. Furthermore, the scheme protects unconditionally against: impersonation /substitution attacks done by an outsider, against disavowal of a message by the sender, and against the receiver forging a message which was never sent. A practical scheme based on finite geometry is presented. Adaptations of the scheme realize an asymmetric conventional authentication scheme, and the set-up of an unconditionally secure oblivious transfer system.