Method and apparatus for electronically preventing unauthorized

Details Method and apparatus for electronically preventing unauthorized Method and apparatus for electronically preventing unauthorized

1995-09-12

1997-12-16

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 3, H04K 100

Patent

active

056994303

ABSTRACT:
An electronic security method and apparatus prevents unauthorized access to a security device, communications equipment or other equipment by generating a data coded signal between an encoding device couple with a transmitter and a decoding device coupled with a receiver; part of the coded signal is fixed but the remainder is continuously and automatically changing with reference to time and synchronization is maintained between transmitter and receiver by an identical timer chip clock in each which operates on the same oscillation frequency; specially designed computer software is used to program an identical microcontroller unit within the transmitter and the receiver.

REFERENCES:
patent: 3725939 (1973-04-01), Saltzstein
patent: 4688036 (1987-08-01), Hirano et al.
patent: 4733638 (1988-03-01), Anderson
patent: 4794268 (1988-12-01), Nakano et al.
patent: 4996514 (1991-02-01), Sunami
patent: 4996515 (1991-02-01), Schaffer et al.
PM 1409, Filed Sep. 24, 1993, "Electronic Security Device".
PM 7814, Filed Sep. 1, 1994, "Electronic Security Device".
PM 9108, Filed Oct. 28, 1994, "Electronic Security Method".
PCT/GB84/00104, Filed Mar. 28, 1984, "Improvements Relating to a Security System".
PCT/AU92/00391, Filed Jul. 30, 1992, "Vehicle Security System".
PCT/AU92/00391, Issued Nov. 13, 1992, International Search Report.

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