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Terminal device, group management server, network communication system, and method for generating encryption key

  • US 7,978,858 B2
  • Filed: 03/31/2008
  • Issued: 07/12/2011
  • Est. Priority Date: 06/26/2007
  • Status: Expired due to Fees
First Claim
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1. A terminal device capable of transmitting and receiving information encrypted with other terminal devices that belong to one group, comprising:

  • a key storage unit storing a group encryption key and deletion keys, the group encryption key for encrypting and decrypting information transmitted and received with other terminal devices that belong to the group, and the deletion keys corresponding to each of the other terminal devices; and

    an update unit generating, if there is a leaving terminal device among the other terminal devices that belong to the group, an updated group encryption key corresponding to a new group encryption key, from the deletion key corresponding to the leaving terminal device and the group encryption key stored in the key storage unit.

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