Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1991-12-31
1994-08-02
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
375 1, 380 29, 380 30, 380 34, 380 49, 379 59, 379 63, 34082531, 34082534, 455 331, 455 531, 455 541, 455 561, H04L 932, H04M 1100
Patent
active
053352785
ABSTRACT:
An improved mobile telephone system, including a process and apparatus for detecting fraudulent requests for roamer cellular telephone services before the requested service is granted. The improvement comprises a distributed, readily updatable fraud prevention processor which facilitates a plurality of independent, geographically dispersed cooperating cellular networks to each locally determine if a roamer request for service is from a valid, currently authorized user subscriber before cellular telephone service is provided by the visited cellular network.
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Birch J. Neil
Matchett Noel D.
Gregory Bernarr E.
Wireless Security, Inc.
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