Data processing: financial – business practice – management – or co – Automated electrical financial or business practice or... – Finance
Patent
1996-11-15
1999-05-25
Trammell, James P.
Data processing: financial, business practice, management, or co
Automated electrical financial or business practice or...
Finance
380 21, 380 24, G06F 1760
Patent
active
059078324
ABSTRACT:
The invention provides a method for protectedly debiting an electronic payment mechanism, such as a telephone card. In the communication protocol between the payment mechanism and payment station, an authentication is used to identify the payment mechanism during various steps of the protocol. According to the invention, the authentications are mutually related by states of a cryptographic process in order to be capable of detecting an interference in the protocol. The method may be applied to existing payment cards having a dynamic memory, it being guaranteed that the contents of the dynamic memory, in which there is located information related to the authentication, is not lost during the protocol.
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Pieterse Rob
Rombaut Willem
Koninklijke PTT Nederland N.V.
Trammell James P.
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