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CRYPTOLOGY CALCULATION FOR LAST USED AUTHENTICATION DEVICE

  • US 20080107266A1
  • Filed: 10/31/2007
  • Published: 05/08/2008
  • Est. Priority Date: 11/03/2006
  • Status: Abandoned Application
First Claim
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1. A passive start and entry system for a motor vehicle comprising:

  • a control module including a transmitter for transmitting a challenge transmission and a receiver for receiving a response to the challenge transmission; and

    a plurality of remote control devices, wherein the control module calculates an encrypted signal for only a last authenticated one of the plurality of remote control devices before receipt of a response signal from any of the plurality of remote controls.

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