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IPTV service provider only allows the users authorized by CAS to access to the contents. In CAS, hierarchical key structure is used to manage users efficiently and securely. The amount of message transmission for key update increases as the number of users goes up. In this paper, we propose the IPTV CAS using group key management scheme based on bottom-up hash tree. The proposed scheme can update...
Route tracing allows authorities to determine the route traversed by a vehicle, which can be used valuably in crime investigations. In VANETs (Vehicular Ad hoc NETwork), a conditional anonymity scheme is normally used to meet the conflicting demands of the government (authentication) and users (privacy). These schemes provide a mechanism to revoke the anonymity of individual beacons sent by vehicles...
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