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Communication device and system for mobile encrypted communication

  • US 5,926,546 A
  • Filed: 10/18/1996
  • Issued: 07/20/1999
  • Est. Priority Date: 10/19/1995
  • Status: Expired due to Term
First Claim
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1. A communication device for installation in a vehicle to perform a communication operation with a roadside device when said communication device is within a communication area of said roadside device, said communication device comprising:

  • drive means for receiving an IC card that stores predetermined card data;

    communication means for performing said communication operation with said roadside device by transmitting transmission data generated based on said card data to said roadside device and by receiving reception data from said roadside device when said communication device is within said communication area of said roadside device; and

    cryptographic means for encrypting, using a first encryption algorithm, said card data read through said drive means to generate said transmission data and for decrypting, using said first encryption algorithm, said reception data to obtain decrypted data,said cryptographic means further encrypting, using a second encryption algorithm different from said first encryption algorithm, a result of said communication operation, and storing said result of said communication operation encrypted using said second encryption algorithm in said IC card through said drive means.

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