International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Paper: More Compact E-Cash with Efficient Coin Tracing

Authors:
Victor K. Wei
Download:
URL: http://eprint.iacr.org/2005/411
Search ePrint
Search Google
Abstract: In 1982, Chaum \cite{Chaum82} pioneered the anonymous e-cash which finds many applications in e-commerce. In 1993, Brands \cite{Brands93apr,Brands93,Brands93tm} and Ferguson \cite Ferguson93c,Ferguson93} published on single-term offline anonymous e-cash which were the first practical e-cash. Their constructions used blind signatures and were inefficient to implement multi-spendable e-cash. In 1995, Camenisch, Hohenberger, and Lysyanskaya \cite{CaHoLy05} gave the first compact $2^\ell$-spendable e-cash, using zero-knowledge-proof techniques. They left an open problem of the simultaneous attainment of $O(1)$-unit wallet size and efficient coin tracing. The latter property is needed to revoke {\em bad} coins from over-spenders. In this paper, we solve \cite{CaHoLy05}'s open problem, and thus enable the first practical compact e-cash. We use a new technique whose security reduces to a new intractability Assumption: the {\em Decisional Harmonic-Relationed Diffie-Hellman (DHRDH) Assumption}.
BibTeX
@misc{eprint-2005-12744,
  title={More Compact E-Cash with Efficient Coin Tracing},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / e-cash},
  url={http://eprint.iacr.org/2005/411},
  note={ kwwei@ie.cuhk.edu.hk 13105 received 17 Nov 2005},
  author={Victor K. Wei},
  year=2005
}