User authentication method and apparatus
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United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
Jun 24, 1994
filing date -
Jun 24, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
Authorization for a user to use a service is provided by a modified pager which calculates a unique response code to a transmitted challenge code based on the challenge code, an input personal identification number, and an internal key. The response code is input to a simple terminal, such as a telephone and if the unique response code is acceptable, the user may access the desired service, such as cashless transactions or long distance phone service.
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