Method of debiting an electronic payment means
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United States of America Patent
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May 25, 1999
Grant Date -
N/A
app pub date -
Nov 15, 1996
filing date -
Nov 15, 1995
priority date (Note) -
In Force
status (Latency Note)
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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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