Installation for controlling and monitoring the different coded

Details Installation for controlling and monitoring the different coded Installation for controlling and monitoring the different coded

1987-07-08

1991-02-12

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

70278, H04Q 900, E05B 4900

Patent

active

049927850

ABSTRACT:
An installation for controlling and monitoring the different coded locks of an assembly embodying: An issuer for elaborating coded keys for controlling said locks and a reader associated with each lock, adapted for unlocking this lock on simple presentation thereto of a correctly coded key, this issuer and this reader being adapted so that detection by said reader of the code y recorded by said issuer on each new key of order p assigned to the lock associated with this reader results in the invalidation of the code x recorded on the key of order p-1 previously assigned to this lock, each code y being derived from code x by an algorithm y=f(x) stored at least in the issuer. At any time the reader is responsive simultaneously to a number m greater than 2 of a non invalidated codes of the succession x, f(x), f.sup.2 (x) . . . f.sup.n (x) and is adapted so that by reading any one of these codes it automatically invalidates all the lower rank codes of the succession considered.

REFERENCES:
patent: 3800284 (1974-03-01), Zucker et al.
patent: 3860911 (1975-01-01), Hinman et al.
patent: 4352011 (1982-08-01), Guillou
patent: 4396914 (1983-08-01), Aston
patent: 4494114 (1985-01-01), Kaish
patent: 4511946 (1985-04-01), Mc Gahan
patent: 4558175 (1985-12-01), Genest et al.
patent: 4596985 (1986-06-01), Bongard et al.
patent: 4630201 (1986-12-01), White
patent: 4642631 (1987-02-01), Rak
EP 0044630 A1, 01/27/82, Walter John Aston.
EP 0043270 A1, 01/06/82, Kazuo Mizutani.

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