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Title: Off-line compatible electronic cash method and system

Abstract

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 An electronic coin is withdrawn from the bank B by the user U and an electronic record of the electronic coin is stored by the bank B. The coin is paid to the payee S by the user U. The payee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 bymore » the secret key of the bank indicating 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. 16 figs.« less

Inventors:
; ;
Issue Date:
Research Org.:
Sandia Corporation
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
675844
Patent Number(s):
5,832,089
Application Number:
PAN: 8-474,035
Assignee:
Sandia Corp., Albuquerque, NM (United States) SNL; SCA: 990200; PA: EDB-99:004397; SN: 98002027965
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 3 Nov 1998
Country of Publication:
United States
Language:
English
Subject:
99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; FINANCING; DIGITAL SYSTEMS; SECURITY; COMPUTER NETWORKS; USES

Citation Formats

Kravitz, D.W., Gemmell, P.S., and Brickell, E.F. Off-line compatible electronic cash method and system. United States: N. p., 1998. Web.
Kravitz, D.W., Gemmell, P.S., & Brickell, E.F. Off-line compatible electronic cash method and system. United States.
Kravitz, D.W., Gemmell, P.S., and Brickell, E.F. Tue . "Off-line compatible electronic cash method and system". United States.
@article{osti_675844,
title = {Off-line compatible electronic cash method and system},
author = {Kravitz, D.W. and Gemmell, P.S. and Brickell, E.F.},
abstractNote = {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 bank indicating 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. 16 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {11}
}