Universally Composable Time-Stamping Schemes with Audit

  • Ahto Buldas
  • Peeter Laud
  • Märt Saarepera
  • Jan Willemson
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3650)

Abstract

We present a Universally Composable (UC) time-stamping scheme based on universal one-way hash functions. The model we use contains an ideal auditing functionality, the task of which is to check that the rounds’ digests are correctly computed. Our scheme uses hash-trees and is just a slight modification of the known schemes of Haber-Stornetta and Benaloh-de Mare, but both the modifications and the audit functionality are crucial for provable security. We prove that our scheme is nearly optimal – in every UC time-stamping scheme, almost all time stamp requests must be communicated to the auditor.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Ahto Buldas
    • 1
    • 2
    • 3
  • Peeter Laud
    • 1
    • 2
  • Märt Saarepera
    • 1
  • Jan Willemson
    • 1
    • 4
  1. 1.University of TartuTartuEstonia
  2. 2.CyberneticaTallinnEstonia
  3. 3.Tallinn University of TechnologyTallinnEstonia
  4. 4.Playtech EstoniaTartuEstonia

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