European Public Key Infrastructure Workshop

EuroPKI 2007: Public Key Infrastructure pp 181-192

Anonymous k-Show Credentials

  • Mohamed Layouni
  • Hans Vangheluwe
Conference paper

DOI: 10.1007/978-3-540-73408-6_13

Volume 4582 of the book series Lecture Notes in Computer Science (LNCS)
Cite this paper as:
Layouni M., Vangheluwe H. (2007) Anonymous k-Show Credentials. In: Lopez J., Samarati P., Ferrer J.L. (eds) Public Key Infrastructure. EuroPKI 2007. Lecture Notes in Computer Science, vol 4582. Springer, Berlin, Heidelberg

Abstract

Privacy-preserving digital credentials are cryptographic tools that allow a user to prove a predicate about his/her identity or qualifications, without the verifying party learning additional information beyond the status of that predicate. The Identity Mixer (Idemix) [CL01] is a framework providing such credentials. In Idemix, we can distinguish two types of credentials: (1) one-time show credentials which can be shown only once before unveiling the identity of their holder, and (2) multi-show credentials which can be shown infinitely many times without the showings being linked to each other, or to the identity of their holder. In this paper, we bridge the gap between the two previous types of credentials, and extend Idemix to k-show credentials (for k > 1.) The k-show credentials we propose can be shown anonymously, but linkably, up to k times.

Keywords

Privacy-preserving digital credentials anonymity multiple-show credentials 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Mohamed Layouni
    • 1
  • Hans Vangheluwe
    • 1
  1. 1.School of Computer Science, McGill University, 3480 University Street, Montreal, H3A 2A7, QuebecCanada