Commentary: A critique of "A novel electronic cash system with trustee-based anonymity revocation from pairing," by Chen, Chou, Sun and Cho (2011)

  • Authors:

  • Ya-Fen Chang

  • Affiliations:

  • Department of Computer Science and Information Engineering, National Taichung University of Science and Technology, Taichung 404, Taiwan

  • Venue:
  • Electronic Commerce Research and Applications
  • Year:
  • 2012

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Abstract

This brief critique discusses a recent article by Chen et al. (2011) published in the journal. The authors proposed an electronic cash (e-cash) scheme with trustee-based anonymity revocation from pairing. I found that there are a couple issues that are not properly addressed. (1) The first flaw is that a bank can trace an e-cash payer easily and obtain the payer's license for illegal usage because the related blind factor that is chosen is fixed, and thus, it is not properly removed from the e-cash in the authors' scheme. (2) The second flaw is that it is possible for someone to dishonestly cooperate with an honest bank's customer to defraud the honest bank, and this person's identity cannot be traced.