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Network encryption key rotation

  • US 8,989,379 B2
  • Filed: 01/09/2008
  • Issued: 03/24/2015
  • Est. Priority Date: 06/04/2007
  • Status: Active Grant
First Claim
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1. A method for key rotation by a headend device, the method comprising:

  • providing an initial counter value to a station;

    incrementing the initial counter value at the headend device based on a non-linear function to produce a headend incremented counter value; and

    sending a key rotation communication from the headend device to the station, the key rotation communication comprising a new network encryption key and the headend incremented counter value, the key rotation communication to replace a previous network encryption key with the new network encryption key,wherein the headend incremented counter value authenticates the key rotation communication based, at least in part, on the headend incremented counter value matching a station incremented counter value that is derived from the initial counter value and the non-linear function.

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