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The problem is not with compression and encryption, it is with the protocol that is being used, and the type of data being compressed (or not) prior to encryption. The most damning leaks are on protocols that were either designed to be compressed without encryption, or encrypted without compression. The best example I have is VOIP systems that use a ...


Read about the CRIME and BREACH attacks. They are the classic example where compression before encryption can leak information about the input. The length of the compressed data leaks information about the contents of the data itself. See also http://security.stackexchange.com/q/19911/971 and http://security.stackexchange.com/q/20406/971 and ...

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