ABSTRACT
The basic idea of selective encryption is to encrypt only a portion of the compressed bit stream. The experts should investigate the security aspects of the newly proposed multimedia encryption techniques. To deal with the technical challenges, two major multimedia security technologies are being developed: Multimedia encryption technology to provide end-to-end security when distributing digital content over a variety of distribution systems and Multimedia watermarking technology as a tool to achieve copyright protection, ownership trace, and authentication. The three most important objectives of cryptography with respect to multimedia information security include confidentiality, data integrity, and authentication. Modern cryptographic techniques provide solutions for these three objectives. In general, there are two types of cryptosystems: symmetric key cryptosystems and asymmetric key cryptosystems. The chapter discusses different research directions that were taken in the area of video communication encryption. In order to meet real-time constraints for audio and video multimedia playback, selective encryption techniques have been proposed.
