Run-time Performance Evaluation for a Secure MPEG System Supporting Both Selective Watermarking and Encryption

MPEG (ISO Moving Picture Expert Group) is a compression standard for video processing and is widely used in multimedia application, e.g. VOD (video on demand), HDTV (High Definition Television), and DVD (Digital Video Disk). Confidentiality [MS95, AG96] and Copyright protection [HG96] are two security-related issues that have recently brought many attentions, especially when the MPEG streams are transmitted over the public Internet. In this paper, we present a research prototype which integrates selective encryption schemes with watermarking techniques in one system. In particular, we propose simple and efficient schemes to securely distribute watermarked MPEG video streams over multicast/broadcastchannels. We have experimented 10 different selective encryptionschemes and one selective watermarking scheme on three well-known MPEG streams: Bus, Flower, and Miss America. Our first result shows that how much "speeding-up" of the MPEG decoding/decrypting process can be obtained with diff..