Communications: electrical – Continuously variable indicating – With meter reading
Patent
1988-04-04
1991-02-12
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082531, 380 46, H04Q 900
Patent
active
049927833
ABSTRACT:
All subscribers operating within a communication system initially generate and transmit a random password and their ID code to the operation (control) center of a communication system. Thereafter, in a first embodiment, subscribers are commanded to modify (in a predetermined manner) and re-transmit their password and ID code either periodically or upon requesting access to the communication system. The modified password is retained as the current (authorized) password by both the subscriber and the system. In a second embodiment, subscribers are commanded to generate and transmit a new random password and their ID code to the system, which maintains a history of each subscriber's current and previous passwords. According to the invention, some of the subscribers having an unauthorized (duplicated) ID code may be inactive (off) when the subscriber is commanded to modify or generate a password. In this way, one of the subscribers having an unauthorized (duplicated) ID code will become out-of-sync with the system, and eventually transmit an unauthorized password. When the system receives an incorrect password for an out-of-sync subscriber, access to the communication system may be denied, and the subscribers that duplicate (or permit others to duplicate) ID codes may be identified.
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Bieri Philip A.
Schorman Eric R.
Zdunek Kenneth J.
Egan Wayne J.
Holloway, III Edward C.
Motorola Inc.
Yusko Donald J.
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