Revisiting the security model for timed-release encryption with pre-open capability

  • Authors:
  • Alexander W. Dent;Qiang Tang

  • Affiliations:
  • University of London, Surrey, UK;University of London, Surrey, UK and Departement d'Informatique, École Normale Supérieure, Paris Cedex 05, France

  • Venue:
  • ISC'07 Proceedings of the 10th international conference on Information Security
  • Year:
  • 2007

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Abstract

The concept of timed-released encryption with preopen capability (TRE-PC) was introduced by Hwang, Yum and Lee. In a TRE-PC scheme, a message is encrypted in such a way that it can only be decrypted at a certain point in time or if the sender releases a piece of trapdoor information known as a pre-open key. This paper examines the security model for a TRE-PC scheme, demonstrates that a TRE-PC scheme can be constructed using a KEM-DEM approach, and provides an efficient example of a TRE-PC scheme.