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With the rapid development of information technology, multimedia data are transmitted over all kinds of wired/wireless networks more and more frequently. Consequently, the security of multimedia data becomes a serious concern of many people. However, the traditional text encryption schemes can not be used in a naive way to protect multimedia data efficiently in some applications, mainly due to the big differences between textual and multimedia data and some special requirements of the whole multimedia system. This challenge stirs the design of special multimedia encryption schemes to become a hot research topic in multimedia signal processing area in the past decade. Because of the subtle similarity between chaos and cryptography, a great number of multimedia encryption schemes based on chaos have been presented.
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