Method and apparatus for providing authenticated challenges for broadcast-multicast communications in a communication system
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United States of America Patent
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May 13, 2014
Grant Date -
Jun 23, 2005
app pub date -
Sep 1, 2004
filing date -
Sep 2, 2003
priority date (Note) -
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Abstract
A method and apparatus for secure generation of a short-term key SK for viewing information content in a Multicast-broadcast-multimedia system are described. A short-term key is generated by a memory module residing in user equipment (UE) only when the source of the information used to generate the short-term key can be validated. A short-term key can be generated by a Broadcast Access Key (BAK) or a derivative of BAK and a changing value with a Message Authentication Code (MAC) appended to the changing value. A short-term key (SK) can also be generated by using a private key and a short-term key (SK) manager with a corresponding public key distributed to the memory module residing in the user equipment (UE), using a digital signature.
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