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Method and apparatus for providing authenticated challenges for broadcast-multicast communications in a communication system

  • US 20050138379A1
  • Filed: 09/01/2004
  • Published: 06/23/2005
  • Est. Priority Date: 09/02/2003
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving a first value and a first message authentication code;

    generating a second message authentication code as a function of the first value by a hashing function on the received first value using a second value stored in a memory;

    comparing the second message authentication code with the received first message authentication code; and

    computing a key using the first value and the second value provided that the second message authentication code is equal to the first message authentication code.

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