Title:
RETURNING OF CHANGE IN AN ELECTRONIC PAYMENT SYSTEM
Document Type and Number:
WIPO Patent Application WO2002039391
Kind Code:
A3
Abstract:
The invention relates to a method of returning change to a payer in an electronic payment system. A payer determines a change return valu, generates and blinds a change return certificate, generates a first signature by signing the blinded change return certificate, and sends a message comprising the first signature to a payee. The payee forwards the message to a payment provider. The payment provider verifies the first signaure and the change return value indicated by the message, generates a blinded second signature by signing the blinded change retun certificate, and forwards the blinded second signature to the payer. The payer unblinds and verifies the blinded second signature, and forms a second payment certificate. The invention furthermore relates to a method of performing tasks of a payer and to a method of performing tasks of a payment provider in a change return transaction, to computer programs and devices therefore.
Inventors:
WRONA KONRAD (DE)
TRACZ ROBERT DANIEL (PL)
TRACZ ROBERT DANIEL (PL)
Application Number:
PCT/EP2001/012299
Publication Date:
March 20, 2003
Filing Date:
October 24, 2001
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
WRONA KONRAD (DE)
TRACZ ROBERT DANIEL (PL)
WRONA KONRAD (DE)
TRACZ ROBERT DANIEL (PL)
International Classes:
G06Q20/00; (IPC1-7): G07F7/10
Foreign References:
| US5768385A | 1998-06-16 | |||
| US5953423A | 1999-09-14 | |||
| EP0865010A1 | 1998-09-16 |
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