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What is Watermarking and Scrambling

Chapter 22
Handbook of Research on Secure Multimedia Distribution
A watermarking system consists of an embedding algorithm and a detecting function. And scrambling is generally based on old and proven cryptographic tools, efficiently ensures confidentiality, authenticity, and integrity of messages. This mechanism is the combination ones.
Published in Chapter:
Copyright Protection of A/V Codec for Mobile Multimedia Devices
Goo-Rak Kwon (Chosun University, Korea) and Sung-Jea Ko (Korea University, Korea)
Copyright: © 2009 |Pages: 14
DOI: 10.4018/978-1-60566-262-6.ch022
Abstract
The objective of this chapter introduces an advanced encryption of MP3 and MPEG-4 coder with a quality degradation-based security model. For the MP3 audio, the magnitude, and phase information of modified discrete cosine transform (MDCT) coefficients is encrypted. DCT coefficients and motion vectors (MVs) are used for the scrambling of the MPEG-4 video. This encryption scheme has a level of security, secures in perception, keeps format compliance, and obtains high time efficiency though reducing the encrypted the volumes of multimedia contents. These properties make it practical to incorporate encryption and decryption process into compression and decompression process, and thus suitable for secure A/V transmission or sharing.
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