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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 security is important for multimedia commerce. Previous cryptography studies have focused on text data. The encryption algorithms developed to secure text data may not be suitable to multimedia applications because of the large data size and real time constraint. For multimedia applications, light weight encryption algorithms are attractive.(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)
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)
Security in today's wireless camera sensor networks is very crucial for authentication of video feeds from appropriate sources. This will ensure the safety and security of the digital video feeds as well as provide means of authenticating the video. These authentication approaches should be able to identify tamper detection. In this paper, we propose an(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)
We have designed an adaptable network architecture, called AD-NET, which provide mechanisms to allow the application adapt to the resource constraints to achieve improved QoS. In our experiments we compare three schemes (IP fragmentation, ACTP fragmentation with or without active program) of video transmissions. We find QoS is improved in ACTP scheme with(More)