Cryptography – Key management – Key distribution
Reexamination Certificate
2002-08-14
2009-02-17
Parthasarathy, Pramila (Department: 2136)
Cryptography
Key management
Key distribution
C380S270000, C380S274000, C380S044000
Reexamination Certificate
active
07492905
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. To provide even greater security, the transmitter is limited in the number of times it may perform a resynchronization procedure. 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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Fitch Even Tabin & Flannery
Parthasarathy Pramila
The Chamberlain Group, Inc.
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