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Information terminal apparatus, information processing apparatus and information communication system

  • US 8,099,772 B2
  • Filed: 05/28/2008
  • Issued: 01/17/2012
  • Est. Priority Date: 06/26/2002
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a secret key holding section for holding a secret key for the apparatus;

    an identification information holding section for holding identification information of an apparatus or identification information of a user of said apparatus;

    a digital signature means for providing a digital signature of a position/time information indicating position and time of reception of a signal received from a positioning satellite, by means of said secret key held in said secret key holding section;

    a communication means for transmitting to a communication counterpart said identification information held in said identification information holding section and said position/time information having said digital signature attached thereto, said communication means also receiving position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and

    display means for displaying position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus.

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