Selective encryption, information theory and compression

Selective encryption only encrypts a portion of a compressed bitstream, relying on the characteristics of the compression format to render the remaining in-the-clear content unusable. While the technique has been proposed in a number of practical applications, it is also motivated by concepts from the origins of Shannon theory on the links between source coding and encryption and benefits from an evaluation of its performance on compression primitives, such as quantization and Huffman coding, used in constructing many compression algorithms.