Sheng-Yih Wang

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We present a fast MPEG video encryption algorithm called RVEA which encrypts selected sign bits of the DCT coeecients and motion vectors using secret key cryptography algorithms such as DES or IDEA. RVEA features bounded computation time for any size of video frame and is robust to both plaintext and ciphertext attack. Since it adds a very small overhead to(More)
Multimedia data are usually very large in size. Fragmentation of multimedia data unit is inevitable when they are transmitted through networks. Active networks are becoming popular and the active technologies are b eing applied to various interesting problems. When applying active technologies on multime-dia data, however, the problem of fragmenting large(More)
pass Transmission Policy: An Effective method of transmitting large multimedia objects in the wide-area network" (1996). Abstract Multimedia objects such as audio, video and images are usually very large in si>lc and used in time-critical applications. The traditional method of transmitting these large objects over a WAN is to use TCP because of the high(More)
Active network is an excellent paradigm to provide customized network services to the applications by allowing them to inject specific program to the intermediate routers. Active networks provide the flexibility for the application programs to modify the services that a router can provide to suit its specific needs. Therefore, it has the potential to(More)
In active networks environments, the data packets can c q active programs to enable specialized processing on them. We quantify the effectiveness of general capsule programs V.S. specialized processing functions for multimedia data through four experiments. These experiments deal with the comparison of Java V.S. C implementation of a MPEG video decoder, the(More)
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