Electronic door lock key re-sequencing function

Details Electronic door lock key re-sequencing function Electronic door lock key re-sequencing function

1988-01-26

1989-09-26

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825340, 235382, 235382500, 361172, G06K 700, H04Q 302

Patent

active

048704008

ABSTRACT:
An electronic security device has at least one lock and a control center for generating keys to the lock. When a new key is generated, a new (second) combination is generated by applying a predetermined algorithm and randomly generated (first) calculation data to the previous (first) combination. To calculate a next new (third) combination, another randomly generated (second) calculation data is applied to the second combination using the same algorithm. The control center stores, on the key, the third combination, and the second calculation data used to obtain it and the first calculation data used to obtain the second combination. At the lock, the third combination is compared with a stored combination and if there is no match, the lock calculates a possible second combination by applying an algorithm, which is the inverse of the predetermined algorithm, to the stored combination using the second calculation data read from the key. If there is still no match, the lock calculates a possible first combination using the first calculation data read from the key. If there is still no match, the lock will not be opened. In another embodiment of the invention, a check-in time and a check-out time are provided on the key, and the lock will not open unless the time is between the check-in and check-out time when the key is inserted.

REFERENCES:
patent: 3800286 (1974-03-01), Zucker et al.
patent: 3906447 (1975-09-01), Crafton
patent: 4385231 (1983-05-01), Mizutani et al.
patent: 4396914 (1983-08-01), Aston
patent: 4646080 (1987-02-01), Genest et al.

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