Encryption key distribution method in mobile broadcasting system and system for the same

  • US 9,191,204 B2
  • Filed: 06/10/2009
  • Issued: 11/17/2015
  • Est. Priority Date: 06/11/2008
  • Status: Active Grant
First Claim
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1. A method of distributing an encryption key for protecting a broadcasting service in a mobile broadcasting system, comprising the steps of:

  • generating, by a network, first information for encryption key derivation in response to providing the broadcasting service to a terminal, and transmitting a long term key message including the generated first information to the terminal; and

    generating, by the network, second information for encryption key derivation before a lifetime of the first information expires, and transmitting a long term key message including the generated second information to the terminal,wherein the lifetime of the first information and a lifetime of the second information are an integer multiple of a lifetime of a traffic encryption key, the first information and the second information derive a plurality of traffic encryption keys, and the first information and the second information are derived from at least one key seed pair (KSP) composed of KS1, KS2 arbitrarily generated in the network, andwherein the traffic encryption key is calculated based on a hash value of KS1 to which a hash function is applied and a hash value of KS2 to which a hash function is applied, andwherein a message sent for requesting the traffic encryption key includes at least one of a key domain ID and a KSP ID.

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