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Digital watermarking for secure and adaptive teleconferencing

: Vorbrüggen, J.C.; Thorwirth, N.J.

Wong, W.P.; Delp, E.J. ; Society for Imaging Science and Technology -IS&T-; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Security and Watermarking of Multimedia Contents IV
Bellingham/Wash.: SPIE, 2002 (SPIE Proceedings Series 4675)
ISBN: 0-8194-4415-4
Conference on Security and Watermarking of Multimedia Contents <4, 2002, San Jose/Calif.>
Conference Paper
Fraunhofer IGD ()
digital watermarking; active networking; video watermarking; teleconferencing; VPN; security

The EC-sponsored project ANDROID aims to develop a management system for secure active networks. "Active network" means allowing the network's costumers to execute code (Java-based so-called proxylets) on parts of the network infrastructure. "Secure" means that the network operator nonetheless retains full control over the network and its resources, and that proxylets use ANDROID-developed facilities to provide secure applications. Management is based on policies and allows autonomous, distributed decisions and actions to be taken. Proxylets interface with the system via policies: among actions they can take is controlling execution of other proxylets or redirection of network traffic. Secure teleconferencing is used as the application to demonstrate the approach's advantages. A way to control a teleconference's data streams is to use digital watermarking of the video, audio and/or shared-whiteboard streams. Providing an imperceptible and inseparable side channel that delivers information from originating or intermediate stations to downstream stations. Depending on the information carried by the watermark, these stations can take many different actions. Examples are forwarding decisions based on security classifications (possibly time-varying) at security boundaries, set-up and tear-down of virtual private networks, intelligent and adaptive transcoding, recorder or playback control (e. g., speaking "off the record"), copyright protection, and sender authentication.