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Vehicle security device with electronic use authorization coding

  • US 5,774,550 A
  • Filed: 06/26/1997
  • Issued: 06/30/1998
  • Est. Priority Date: 04/01/1994
  • Status: Expired due to Fees
First Claim
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1. Vehicle security device having an electronic use-authorization coding arrangement comprising:

  • a user-end key unit for successively transmitting items of user code information, which items differ from one another;

    a vehicle-end device for receiving the transmitted items of user code information, and generating as a function thereof an item of actual authorization information; and

    means for comparing said item of actual authorization information with an item of desired authorization information present at the vehicle unit, and for generating an item of use-enabling information based on a result of said comparing;

    wherein;

    said user-end key unit includes a signature generating component which utilizes a digital signature algorithm, and which signal generating component has stored therein an item of secret encryption information, for encrypting and transmitting user code information or synchronization information, said user code information or synchronization information containing an item of new desired authorization information, together with a signature generated by said digital signature algorithm; and

    said vehicle end device includes a verification component which utilizes said digital signature algorithm, and which verification component contains an item of nonsecret decryption information, for receiving and decrypting said user code information or synchronization information.

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