Radiotelephone installation for prepayment operation with security protection
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United States of America Patent
Stats
-
Apr 5, 1994
Grant Date -
N/A
app pub date -
Oct 10, 1991
filing date -
Oct 10, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In the course of the intercommunication between the base station and the autonomous telephone set, the first means of authentication initially generates a keyword dependent on the call charge for the current service and transmits it to the autonomous telephone set. The second means of authentication then calculates the transform of the keyword by the encryption function F with the aid of the subscriber's secret key, and transmits the transform to the first means of authentication which finally checks the authenticity of the transform to totally block the intercommunication if the authenticity is not confirmed by the check.
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Family
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