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COMMUNICATION SYSTEM OF CLIENT TERMINALS AND RELAY SERVER AND COMMUNICATION METHOD

  • US 20080162929A1
  • Filed: 09/06/2007
  • Published: 07/03/2008
  • Est. Priority Date: 12/27/2006
  • Status: Active Grant
First Claim
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1. A client terminal comprising:

  • a cipher session establishing section configured to establish a cipher session use connection between said client terminal as a source client terminal and a relay server by transmitting/receiving a cipher session establishment message between said source client terminal and said relay server, and to notify header information contained in a cipher session header to said relay server;

    a shared key managing section configured to hold a client shared key with a destination client terminal;

    a data enciphering section configured to perform encipherment of a data and/or MAC (Message Authentication Code) calculation of said data by using said client shared key and to output the performing result as a client cipher data;

    a message producing section configured to produce a data communication message including a cipher data field in which said client cipher data is inserted and a non-cipher data field in which said cipher session header containing said header information is inserted; and

    a transmitting section configured to transmits said data communication messages destined to said destination client terminal to said relay server by using said cipher session use connection.

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