Initialization method for keyless entry system

Details Initialization method for keyless entry system Initialization method for keyless entry system

1995-10-20

1998-06-16

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 3408253, H04Q 100

Patent

active

057677840

ABSTRACT:
A system for remotely controlling a desired door locking or other function in a vehicle or other protected environment has a transmitter and receiver for communicating a message including a sequence number, the code of a selected function to be performed and an authenticator. An algorithm in the transmitter and in the receiver has a cryptographic key and a seed code. Each algorithm generates the authenticator as a function of both the seed code and the function code; if the authenticators are equal, the message is valid. Upon each transmission the seed code is updated and the sequence number is incremented. The receiver updates its seed code according to the transmitted sequence number to keep the algorithms in synchronism. To initialize the receiver to recognize the transmitter IDs, the receiver is manually enabled for programming, a counter is set to zero, the ID is transmitted from each transmitter, each ID is stored in sequence, and the counter is incremented for each ID received. During access mode only IDs in locations corresponding to the count value and lower values are used for validation.

REFERENCES:
patent: 4750118 (1988-06-01), Heitschel
patent: 5416471 (1995-05-01), Treharne
patent: 5473318 (1995-12-01), Martel
patent: 5506905 (1996-04-01), Markowski

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