Electronic kay storing time-varying code segments generated by a

Details Electronic kay storing time-varying code segments generated by a Electronic kay storing time-varying code segments generated by a

1993-10-12

1995-03-14

Shepperd, John

Registers

Systems controlled by data bearing records

Credit or identification card systems

235382, 34082531, 34082532, E05B 4900

Patent

active

053978846

ABSTRACT:
Complex, time varying codes (e.g., pseudo-random sequences) are used in an access regulating system that includes a number of synchronized elements. The system includes a central computer, or other suitable means to issue one or more time-dependent linking codes that are stored in a memory in a linking device (e.g., a hotel door key) from whence the codes are relayed to an access regulating device (e.g., a hotel door lock) that permits a user access if a stored link code matches a current access code. In a preferred system a trusted central computer and all the access regulating apparatuses have a common epochal time and a common time interval during which a given code is valid. Each access regulating apparatus uses a unique combination of start and tap vectors, known only to the specific access regulating device and to the central computer, to generate a pseudo-random access code for each time interval.

REFERENCES:
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patent: 4870400 (1989-09-01), Downs et al.
patent: 4928098 (1990-05-01), Dannhaeuser
patent: 4988987 (1991-01-01), Barrett et al.
patent: 5140317 (1992-08-01), Hyatt, Jr. et al.
patent: 5198643 (1993-03-01), Miron et al.
patent: 5204663 (1993-04-01), Lee

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