Keyless motor vehicle entry and ignition system

Details Keyless motor vehicle entry and ignition system Keyless motor vehicle entry and ignition system

1997-04-07

1999-08-10

Cangialosi, Salvatore

Cryptography

Cryptanalysis

380 25, H04C 900

Patent

active

059370653

ABSTRACT:
A keyless control system is disclosed which may be employed to gain entry to a motor vehicle and start an engine. When using this system, a user activates a remote control by selecting a function for the motor vehicle to perform. In response, a challenge number is exchanged and used in an encryption algorithm by both the remote control and a control circuit in the motor vehicle to produce independently of each other separate algorithm answers. A first verification indication is produced when the control circuit finds both answers to be the same. The remote control also sends its unique remote control identification and a designation of the selected function to the control circuit. If the received remote control identification matches is on an authorized remote control list stored in the control circuit, a second verification indication is produced. When both the first and second verification indications are produced, the control circuit issues a signal that causes the motor vehicle to perform the selected function.

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Mehrdad Foroozesh, "Protecting Your Data With Cryptography," UNIX Review, Nov. 1996, v14, n12, p. 55(6).
"Specification sheet for HCS410 KeeLoq Code Hopping Encoder and Transponder," Microchip Technology Inc 1996.
"Specification sheet for HCS509 KeeLoq Code Hopping Decoder," Microchip Technology Inc 1996.

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