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Design of integrated multimedia compression and encryption systems

IEEE TRANSACTIONS ON MULTIMEDIA 2005年第5期7卷 828-839页

作者： Wu, CP Kuo, CCJ Univ So Calif Dept Elect Engn Los Angeles CA 90089 USA Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

Two approaches for integrating encryption with multimedia compression systems are studied in this research, i.e., selective encryption and modified entropy coders with multiple statistical models. First, we examine the limitations of selective encryption using cryptanalysis, and provide examples that use selective encryption successfully. Two rules to determine whether selective encryption is suitable for a compression system are concluded. Next, we propose another approach that turns entropy coders into encryption ciphers using multiple statistical models. Two specific encryption schemes are obtained by applying this approach to the Huffman coder and the QM coder. It is shown that security is achieved without sacrificing the compression performance and the computational speed. This modified entropy coding methodology can be applied to most modern compressed audio/video such as MPEg audio, MPEg video, and JPEg/JPEg2000 images.

关键词： confidentiality CELP entropy coder g.723.1 speech coding Huffman coding multimedia encryption selective encryption signal scrambling QM coder

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Fast encryption methods for audiovisual data confidentiality

Fast encryption methods for audiovisual data confidentiality

引用

Conference on Multimedia Systems and Applications III

作者： Wu, CP Kuo, CCJ Univ So Calif Dept Elect Engn Syst Los Angeles CA 90089 USA

ISBN: (纸本)081943874X

Two methodologies for efficient audiovisual data encryption are studied in this research, i.e. selective encryption and MHT (multiple-Huffman-table). We first discuss benefits and limitations of selective encryption, and propose a selective encryption scheme for ITU g.723.1 speech coding. A review of all cryptanalysis work of selective encryption algorithms in the literature is given, our cryptanalysis for the JPEg/MPEg sign-bit encryption scheme is presented, and two rules to determine whether selective encryption for a compression system is suitable are concluded. Then, we investigate another encryption methodology via the manipulation of Huffman coding tables of multimedia coding systems. The MHT scheme chooses several different Huffman tables from a vast number of possible candidates, and uses them alternatively to encode multimedia data. The choice of Huffman tables and the order that they are used are kept secret as the key. This method requires very little computational overhead, and can be applied to the encryption of MPEg audio, MPEg video and JPEg/JPEg2000 images.

关键词： audiovisual data confidentiality multimedia encryption g.723.1 speech coding Huffman coding multiple Huffman table scheme selective encryption

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