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INFORMATION TERMINAL APPARATUS, INFORMATION PROCESSING APPARATUS AND INFORMATION COMMUNICATION SYSTEM

  • US 20080284648A1
  • Filed: 05/28/2008
  • Published: 11/20/2008
  • Est. Priority Date: 06/26/2002
  • Status: Active Grant
First Claim
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1. A method of transmitting position/time information comprising:

  • a positioning step of receiving an electromagnetic wave from a positioning satellite and measuring a reception position and time;

    a digital signature step of providing a digital signature of position/time information indicating said reception position and time acquired in said positioning step by means of a secret key;

    a communication step of transmitting to a communication counterpart said position/time information having said digital signature attached thereto; and

    a transmission step of transmitting identification information of an apparatus or identification information of a user of said apparatus to said communication counterpart in one of prior, after and at time of transmission of said position/time information.

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