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Off-line compatible electronic cash method and system

Patent ·
OSTI ID:871956
 [1];  [1];  [1]
  1. Albuquerque, NM
+ Show Author Affiliations

An off-line electronic cash system having an electronic coin, a bank B, a payee S, and a user U with an account at the bank B as well as a user password z.sub.u,i, has a method for performing an electronic cash transfer. An electronic coin is withdrawn from the bank B by the user U and an electronic record of the electronic coin is stored by the bank B. The coin is paid to the payee S by the user U. The payee S deposits the coin with the bank B. A determination is made that the coin is spent and the record of the coin is deleted by the bank B. A further deposit of the same coin after the record is deleted is determined. Additionally, a determination is made which user U originally withdrew the coin after deleting the record. To perform these operations a key pair is generated by the user, including public and secret signature keys. The public signature key along with a user password z.sub.u,i and a withdrawal amount are sent to the bank B by the user U. In response, the bank B sends a coin to the user U signed by the secret key of the bankindicating the value of the coin and the public key of the user U. The payee S transmits a challenge counter to the user U prior to receiving the coin.

Research Organization:
SANDIA CORP
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
US 5832089
OSTI ID:
871956
Country of Publication:
United States
Language:
English

References (4)

Blind Signatures for Untraceable Payments book January 1983
Untraceable Electronic Cash book January 1990
An efficient electronic payment system protecting privacy book January 1994
NetCash: a design for practical electronic currency on the Internet conference January 1993

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Related Subjects

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