On Wed, 1 Nov 2006, Arno Lehmann wrote:

>> Not if compression happens prior to encryption. :)
>
> Theoretically - yes, but I'm quite sure that encryption usually also
> compresses data.

If the encryption routines also contain compression routines.

> This is completely unverified and refers to encryption
> programs that are rather outdated by now, though...

Assuming you mean PGP: IIRC this made use of gzip to compress the input 
before applying crypto, partly to somewhat increase entropy before hitting 
the encryption routines.

It was possible to give PGP flags to not compress input and this was 
essential when encrypting already-compressed data in order to prevent
output file bloat.

AB


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