Divisible E-Cash Systems Can Be Truly Anonymous

  • Authors:
  • Sébastien Canard;Aline Gouget

  • Affiliations:
  • France Télécom R&D, 42 rue des Coutures, F-14066 Caen, France;Gemalto, 6, rue de la Verrerie, F-92190 Meudon, France

  • Venue:
  • EUROCRYPT '07 Proceedings of the 26th annual international conference on Advances in Cryptology
  • Year:
  • 2007

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Abstract

This paper presents an off-line divisible e-cash scheme where a user can withdraw a divisible coin of monetary value 2Lthat he can parceled and spend anonymously and unlinkably. We present the construction of a security tag that allows to protect the anonymity of honest users and to revoke anonymity only in case of cheat for protocols based on a binary tree structure without using a trusted third party. This is the first divisible e-cash scheme that provides both full unlinkability and anonymity without requiring a trusted third party.