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Key update system, key management device, communication terminal, and key information construction method for multihop network

  • US 20070140480A1
  • Filed: 12/12/2006
  • Published: 06/21/2007
  • Est. Priority Date: 12/20/2005
  • Status: Active Grant
First Claim
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1. A key update system for a multihop network system comprising a key management device that manages keys using a hierarchical structure, and a plurality of communication terminals that obtain the keys, wherein the key management device constructs key information having a hierarchical structure that accords with the structure of the multihop network, and manages the key information, the key management device determining respective encryption keys for encrypting the keys based on the key information, and the communication terminals obtaining the respective keys, wherein the key management device comprises:

  • a key information management portion that constructs and manages the key information;

    an encryption portion that encrypts the keys using the keys included in the key information; and

    a transmission portion that transmits the encrypted keys encrypted by the encryption portion, and the communication terminals respectively comprising;

    a receiving portion that receives the encrypted keys;

    a key management portion that manages, among the keys included in the key information, the keys that need to be held and stored by any given one of the communication terminals; and

    a decryption portion that decrypts the encrypted keys.

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