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Communication apparatus and method

  • US 20050135625A1
  • Filed: 10/27/2004
  • Published: 06/23/2005
  • Est. Priority Date: 12/19/2003
  • Status: Active Grant
First Claim
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1. A communication apparatus which is wirelessly connected to a first terminal and is connected to a plurality of networks corresponding to different security levels and including a first network of a first security level which is a lowest security level of the security levels and a second network of a second security level of the security levels, the communication apparatus comprising:

  • a first storing unit configured to store a first cryptographic algorithm corresponding to the second security level, and an identifier of the first cryptographic algorithm;

    a receiving unit configured to receive from the first terminal a first terminal identifier and a first password corresponding to one of the networks;

    an authentication unit configured to authenticate the first terminal;

    a selecting unit configured to select one of the first security level and the second security level based on an authentication result of the first terminal, the first terminal identifier, and the first password;

    a generating unit configured to generate, when the selecting unit selects the second security level, a cryptographic key used in the first cryptographic algorithm;

    a transmitting unit configured to transmit, when the selecting unit selects the second security level, the cryptographic key and the identifier of the first cryptographic algorithm to the first terminal;

    a first transfer unit configured to transfer, when the selecting unit selects the second security level, a first data item to the second network and a second data item to the first terminal, the first data item obtained by being encrypted by the first terminal using the first cryptographic algorithm and the cryptographic key, and received from the first terminal, and the second data item addressed to the first terminal and received from the second network; and

    a second transfer unit configured to transfer, when the selecting unit selects the first security level, transfer a third data item to the first network and a fourth data item to the first terminal, the third data item received from the first terminal, and the fourth data item addressed to the first terminal and received from the first network.

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