Fair partially blind signatures

  • Authors:
  • Markus Rückert;Dominique Schröder

  • Affiliations:
  • TU Darmstadt, Germany;TU Darmstadt, Germany

  • Venue:
  • AFRICACRYPT'10 Proceedings of the Third international conference on Cryptology in Africa
  • Year:
  • 2010

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Abstract

It is well-known that blind signature schemes provide full anonymity for the receiving user. For many real-world applications, however, this leaves too much room for fraud. There are two generalizations of blind signature schemes that compensate this weakness: fair blind signatures and partially blind signatures. Fair blind signature schemes allow a trusted third party to revoke blindness in case of a dispute. In partially blind signature schemes, the signer retains a certain control over the signed message because signer and user have to agree on a specific part of the signed message. In this work, we unify the previous well-studied models into a generalization, called fair partially blind signatures. We propose an instantiation that is secure in the standard model without any setup assumptions. With this construction, we also give a positive answer to the open question of whether fair blind signature schemes in the standard model exist.