Abstract
The application of digital video distribution is reaching a wider spectrum of customers, in which secure access control of video content during rendering and transmission has become more and more necessary and urgent. Considering the limited computing power and the real-time requirement of set-top boxes, the efficiency of the decryption process is particularly significant. In this paper, we try to search for a scheme to improve the efficiency of the exist schemes for access control of digital video in set-top boxes mainly from three approaches. Firstly, with the specific comparison between AES and RC6, we conclude that RC6 provides sufficient security for set-top boxes, and the decryption process of RC6 is more efficient. Secondly, we improve the efficiency of the codecs process by adopting a latest more efficient video codec VP9, which is an open and royalty free video codec and is proved to be more efficient than H.264. Finally, we could only selective encrypt and decrypt some essential parts of the entire video stream during the codecs process to further improve the efficiency. In a conclusion, we propose a more efficient idea to provide access control of digital video in set-top boxes. This scheme is proved to be more efficient and more practical.
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