Efficient SVC encryption scheme in CAS for supporting heterogeneous devices

CAS used in IPTV and DTV was designed to transfer a single content through a single stream, but combined with SVC, it can be improved to support diverse video applications through a single streaming. For the environment, it is necessary to put efficiency in priority and to apply hierarchical management scheme in order to provide charging policy by each service class. In this paper, we investigated the issues that could occur as SVC was applied to CAS, and proposed SVC encryption scheme in the CAS environment. The proposed scheme´s safety was based on the safety of the existing CAS and one-way hash function, and the scheme has an advantage of applying to the existing CAS with relatively small overheads.