Automatic resynchronization for remote keyless entry systems

Details Automatic resynchronization for remote keyless entry systems Automatic resynchronization for remote keyless entry systems

1996-12-16

1999-01-19

Hayes, Gail O.

Cryptography

Key management

Having particular key generator

380 23, 380 49, 34082569, H04K 100

Patent

active

058622250

ABSTRACT:
The present invention teaches a method and system for resynchronizing a remote keyless entry receiver having received a new encrypted message transmitted by the transmitter which does not match a previous encrypted message, also transmitted by the transmitter, and stored in memory. The method comprises a first step of transmitting and receiving a first new follow up encrypted message. Subsequently, the received new encrypted message is re-encrypted, and that result is tested against the received first new follow up encrypted message to determine whether there is a match. In the event both match, a second new follow up encrypted message transmitted and received. At this point, the received re-encrypted new encrypted message is re-encrypted a second time, and that result is tested against the received second new follow up encrypted message to determine whether there is a further match. If a match is made, the received second new follow up encrypted message is decrypted and the command within the received and decrypted second new follow up encrypted message is initiated.

REFERENCES:
patent: 4825210 (1989-04-01), Bachhuber et al.
patent: 5369706 (1994-11-01), Latka
patent: 5646996 (1997-07-01), Latka

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