METHOD AND APPARATUS FOR PROVIDING AUTHENTICATED CHALLENGES FOR BROADCAST-MULTICAST COMMUNICATIONS IN A COMMUNICATION SYSTEM

摘要

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-te rm 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 modul e residing in the user equipment (UE), using a digital signature.