Apparatus and method for preventing unauthorized access to a sys

Details Apparatus and method for preventing unauthorized access to a sys Apparatus and method for preventing unauthorized access to a sys

1995-06-02

1997-04-01

Chin, Wellington

Telephonic communications

With usage measurement

Call charge metering or monitoring

379112, 379113, 379144, 379145, H04M 1500, H04M 1700

Patent

active

056174705

ABSTRACT:
Apparatus and methods for preventing access to a telephone service by unauthorized users employ an access code preferably having a fixed component which identifies an authorized user, and having a plurality of variable components associated with the fixed component so that at least one of the plurality of variable components is currently valid for the purpose of processing a telephone call by the service. The variable component is changed from among the plurality of variable components with each telephone call in a predetermined sequence to prevent stealing of the access code by unauthorized users. A credit card may be employed listing the plurality of variable access codes in a predetermined sequence to allow the authorized user to determine which variable component will be currently recognized by the telephone service based on the number of telephone call made with the credit card. A cellular phone may be used with the telephone service to automatically generate the currently valid variable component of the access code when a new telephone call is made.

REFERENCES:
patent: 5287403 (1994-02-01), Atkins
patent: 5357564 (1994-10-01), Gupta
patent: 5479494 (1995-12-01), Clitherow
patent: 5502759 (1996-03-01), Cheng
patent: 5506893 (1996-04-01), Buscher

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