Privacy-Protection in Real-Time Video Communication

Nowadays, video communication of people such as video-phone and video conferencing systems must protect privacy, especially when these applications are based on open IP-network. In this paper, symmetric key encryption and public-key encryption techniques are used to ensure privacy information security. At the same time, a real-time scrambling approach to conceal video information is presented. The sign of transform coefficients for Intra macro-block is pseudo randomly flipped, and so only the authorized persons are allowed to correctly decode the code-stream. Simulation results based on MPEG-4 show that the proposed end-to-end security scheme is feasible. Furthermore, this is achieved with a small impact on coding performance and negligible computation complexity increase.