Method for code protection using an electronic key

Details Method for code protection using an electronic key Method for code protection using an electronic key

1988-10-27

1990-05-22

Safourek, Benedict V.

Communications: electrical

Continuously variable indicating

With meter reading

34082569, 34082531, 34082534, 361171, H04Q 302, H04Q 700

Patent

active

049280988

ABSTRACT:
In a method for code protection of an electronic key, a plurality of codes n are stored in a transmitter and in a receiver and a new, coinciding code is automatically set in the transmitter and in the receiver after each transmission and reception event, respectively. The code transmitted by the transmitter contains information for the receiver with respect to which code is to be selected from the stored set of codes as the next code to be utilized.

REFERENCES:
patent: 4535333 (1985-08-01), Twardowski
patent: 4596985 (1986-06-01), Bongard et al.
patent: 4652860 (1987-03-01), Weishaupt et al.
patent: 4825210 (1989-04-01), Bachhuber et al.

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