Cryptography – Key management – Having particular key generator
Reexamination Certificate
2007-06-12
2007-06-12
Zand, Kambiz (Department: 2132)
Cryptography
Key management
Having particular key generator
C380S045000, C380S278000, C380S283000, C380S284000, C700S009000, C700S065000, C700S079000, C700S083000, C700S274000, C700S282000
Reexamination Certificate
active
10643436
ABSTRACT:
Methods and apparatus are provided for sending an encrypted command message from a remote keyless entry device to a receiver in a motor vehicle. The method comprises defining a key generating key within the remote keyless entry device, and using that key generating key to generate a working key. The working key is transmitted from the remote keyless entry device to the receiver during a training session without transmitting the key generating key. The working key is modified each time the remote keyless entry device is placed in the training mode. After the training session, a message encrypted with the working key can be transmitted from the remote keyless entry device to the motor vehicle receiver where the encrypted message is decrypted with the working key.
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Doug Conner, Cryptographic Techniques Secure Your Wireless Designs, Jan. 18, 1996, EDN, pp. 1-11, printed on Oct. 6, 2006.
Forest Thomas M.
Utter Thomas E.
General Motors Corporation
Lanier Benjamin E.
Marsh Timothy J.
Zand Kambiz
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