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Yes! there exist some examples. But whether they are secure or not is another question. In my opinion, there should not be any problem with the idea of crypto-compression**. Examples of crypto-compression schemes are Secure Arithmetic Coding, Secure Huffman Coding, Secure Adaptive Huffman Coding, and so on. However, as far as I know most of the schemes ...


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Although I do not have a formal proof I think a compressing encryption algorithm could not be secure. The reason is that we know there is no way to compress every input (information theoretically this is impossible). That means that a lossless compression algorithm can really only compress certain input strings. That in turn means that if our encryption ...



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