Klaus Post 0149382cdc Add padding to compressed+encrypted files (#15282) ...

Add up to 256 bytes of padding for compressed+encrypted files.

This will obscure the obvious cases of extremely compressible content 
and leave a similar output size for a very wide variety of inputs.

This does *not* mean the compression ratio doesn't leak information 
about the content, but the outcome space is much smaller, 
so often *less* information is leaked.

2022-07-13 07:52:15 -07:00

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