Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-03-03
1995-05-30
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 46, 380 21, H04K 100
Patent
active
054209250
ABSTRACT:
An encryption process for a rolling code of a remote keyless entry system. The encryption process makes use of a command code shift register, a security code shift register, and a sequence code shift register in which the contents of these registers is transmitted from a portable transmitter to a receiver associated with the vehicle in order to perform a desirable function. The command code shift register provides the code of the function to be performed and the sequence code shift register provides a sequence code for updating the sequence of the receiver. The security code shift register includes a security code which is updated by a first and second pseudo random number generator after each transmission. Each of two pseudo random number generators include associated shift registers and exclusive NOR gates such that a first bit location and a tap bit location of each of the shift registers are exclusively NORed to provide a first bit location in the shift register. A series of the bit locations of the first and second shift registers are exclusively ORed together to set the bits of the security code register.
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Patent Application Serial No. 07/885,624, filed May 18, 1992, entitled "Passive Keyless Entry System", inventor Thomas J. Waraksa et al., and assigned to Lectron Products, Inc.
Cain David C.
Lectron Products, Inc.
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