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Unlinkable Divisible Electronic Cash

  • Toru Nakanishi
  • Yuji Sugiyama
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1975)

Abstract

Recently, some divisible electronic cash (e-cash) systems have been proposed. However, in existing divisible e-cash systems, efficiency or unlinkability is not sufficiently accomplished. In the existing efficient divisible cash systems, all protocols are conducted in the order of the polynomial of logN where N is the divisibility precision (i.e., (the total coin amount)/ (minimum divisible unit amount)), but payments divided from a coin are linkable (i.e., anyone can decide whether the payments are made by the same payer). The linked payments help anyone to trace the payer, if N is large. On the other hand, in the existing unlinkable divisible e-cash system, the protocols are conducted in the order of the polynomial of N, and thus it is inefficient for large N. In this paper, an unlinkable divisible e-cash system is proposed, where all protocols are conducted in the order of (logN)2.

Keywords

Electronic cash Divisibility Unlinkability Group signature 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Toru Nakanishi
    • 1
  • Yuji Sugiyama
    • 1
  1. 1.Department of Communication Network EngineeringFaculty of Engineering, Okayama UniversityOkayamaJapan

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