MOBILE CONDITIONAL ACCESS SYSTEM FOR UNIDIRECTIONAL DEVICES

摘要

PURPOSE: A mobile conditional access system for a unidirectional mobile terminal is provided to use a public key matched with an issued key, thereby safely sharing a newly generated SMK(Subscriber Management Key). CONSTITUTION: A CAS server(100) transmits an LTKM(Long-Term Key Message) and an STKM(Short-Term Key Message). A PC agent(200) receives information necessary for executing AKA(Authentication and Key Agreement) and the LTKM. A unidirectional CAS client(300) decodes the LTKM and STKM to obtain a TEK(Traffic Encryption Key) necessary for operating a CAS service.