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Server apparatus, terminal device, and method for performing IP multicast communication

  • US 8,140,844 B2
  • Filed: 02/13/2007
  • Issued: 03/20/2012
  • Est. Priority Date: 07/26/2006
  • Status: Expired due to Fees
First Claim
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1. A server apparatus for managing an encryption key used for multicast communication between a plurality of terminals, the server apparatus comprising:

  • a first storage unit configured to store therein presence information including a communication state of the terminals;

    a second storage unit configured to store therein in associated manner a terminal identifier unique to each of the terminals and an encryption key to be used for multicast communication within a multicast group to which each of the terminals belongs;

    a receiving unit configured to receive a subscription request message from a first terminal from among the terminals, the subscription request message including a first terminal identifier unique to the first terminal and a request requesting subscription to presence information stored in the first storage unit;

    an acquiring unit configured to acquire a first encryption key to be used for multicast communication within a first multicast group to which the first terminal belongs from the second storage unit by using the first terminal identifier; and

    a transmitting unit configured to transmit an acquired first encryption key to the first terminal together with the presence information requested for subscription.

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