Efficient frequency domain selective scrambling of digital video

By Wenjun Kevin Zeng, S. Lei. IEEE Trans. Multim., 2003

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Design of integrated multimedia compression and encryption systems (2005, background): “Diagram of the selective encryption scheme. the scrambling technique [9], [14], [15], deterioration in compression efficiency is inevitable.”
Commutative Encryption and Watermarking in Video Compression (2007, background): “Different from text/binary data encryption [7], video encryption often requires the scheme be time efficient and format complaint [5], [6] in order to meet real time applications.”
A general quantitative cryptanalysis of permutation-only multimedia ciphers against plaintext attacks (2008, background): “According to the format of the multimedia data to be encrypted, a lot of elements can be permuted in a secure way: pixels (samples), bitplanes, lines, rows, blocks, macroblocks, slices, transform coefficients, VLC (variable-length codewords) syntax elements, tree nodes, and so on [14–40].”