Cryptography – Communication system using cryptography – Symmetric key cryptography
Patent
1997-06-11
2000-11-28
Laufer, Pinchus M.
Cryptography
Communication system using cryptography
Symmetric key cryptography
34082572, H04L 900
Patent
active
061545449
ABSTRACT:
A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.
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Farris Bradford L.
Fitzgibbon James J.
Laufer Pinchus M.
Song Ho S.
The Chamberlain Group, Inc.
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