Signalling scheme for controlling data encryption device in an electronic fund transaction processing system
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United States of America Patent
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-
Dec 29, 1992
Issued Date -
N/A
app pub date -
Jul 25, 1991
filing date -
Dec 9, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method for communicating with a data encryption device is described. In accordance with this invention, a data encryption device adapted for providing encryption functions such as data encryption and decryption may be controlled with an inventive signalling protocol which provides two-way, symmetrical messaging. Data encryption messages are sent to a data encryption device with a message packet which includes a start of message character, a token field, a token dependent data field, a token delimiter and an end of message character. Once the requested data encryption function is performed, a response message is generated wherein the response message mirrors the request message with the exception that the token dependent data comprises data which was processed in accordance with the requested function. The method of the present invention is also adapted for loading key information in the data encryption device as well as communicating system status information.
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