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Limited-traceability systems

  • US 5,878,140 A
  • Filed: 10/06/1997
  • Issued: 03/02/1999
  • Est. Priority Date: 02/08/1994
  • Status: Expired due to Term
First Claim
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1. In a payment system apparatus, the improvement comprising:

  • means for providing a blind signature signal associated with electronic payment data;

    means for forming at least part of one blinding signature signal, instead of at random from a substantially uniform distribution, from a distribution that is subject to a predetermined restriction; and

    means for convincing at least one party that at least the restriction substantially applies without revealing the at least part of the one blinding signal to the at least one party.

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