Provably Secure Electronic Cash Based on Blind Multisignature Schemes

  • Yoshikazu Hanatani
  • Yuichi Komano
  • Kazuo Ohta
  • Noboru Kunihiro
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4107)

Abstract

Though various blind multisignature schemes have been proposed for secure electronic cash, the formal model of security was not discussed. This paper first formalizes the security notions for e-cash schemes based on the blind multisignature scheme. We then construct a blind multisignature scheme and propose a new untraceable e-cash scheme which is provably secure under the DDH assumption in the random oracle model applying the blind multisignature scheme. The proposed scheme can ensure the framing attack by banks where they collude to simulate the double-spending of an honest user.

Keywords

Blind multisignature electronic cash provable security random oracle model 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Yoshikazu Hanatani
    • 1
  • Yuichi Komano
    • 2
  • Kazuo Ohta
    • 1
  • Noboru Kunihiro
    • 1
  1. 1.The University of Electro-CommunicationsTokyoJapan
  2. 2.TOSHIBA CorporationKawasaki-shi, KanagawaJapan

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