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Unconditionally Secure Signature Schemes Revisited

  • Colleen M. Swanson
  • Douglas R. Stinson
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6673)

Abstract

Unconditionally secure signature (USS) schemes provide the ability to electronically sign documents without the reliance on computational assumptions needed in traditional digital signatures. Unlike digital signatures, USS schemes require both different signing and different verification algorithms for each user in the system. Thus, any viable security definition for a USS scheme must carefully treat the subject of what constitutes a valid signature. That is, it is important to distinguish between signatures that are created using a user’s signing algorithm and signatures that may satisfy one or more user verification algorithms. Moreover, given that each verifier has his own distinct verification algorithm, a USS scheme must necessarily handle the event of a disagreement. In this paper, we present a new security model for USS schemes that incorporates these notions, as well as give a formal treatment of dispute resolution and the trust assumptions required. We provide formal definitions of non-repudiation and transferability in the context of dispute resolution, and give sufficient conditions for a USS scheme to satisfy these properties. Finally, we present the results of an analysis of Hanaoka et al.’s construction in our security model.

Keywords

Signature Scheme Dispute Resolution Security Model Authentication Code Signature Pair 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Colleen M. Swanson
    • 1
  • Douglas R. Stinson
    • 1
  1. 1.David R. Cheriton School of Computer ScienceUniversity of WaterlooWaterlooCanada

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