Combining SVC and CAS modules to support heterogeneous devices

CAS used in IPTV and DTV was designed to transfer a single content through a single stream. But, if CAS is combined with SVC coding technique, it can be improved to support diverse video applications through a single streaming. In this paper, we analyze the issues that can occur if SVC is applied to CAS, and also propose SVC encryption module in the CAS environment. The proposed scheme´s safety is guaranteed by the safety of the existing CAS and oneway hash function. Also, the proposed scheme has an advantage of relatively small overheads in the existing CAS.