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On Mon, Jun 25, 2012 at 10:10 AM, Enrico Colombini <> wrote:
> On 25/06/2012 16.28, Roberto Ierusalimschy wrote:
>> Encripted files have exactly the same information content of the
>> original, but usually they do not compress at all.
> You're right, of course. But do not commonly used encription systems add
> pseudorandom information on purpose? (I confess my limited knowledge here).

All encryption systems do. An encryption key is a piece of data that,
to anyone who doesn't possess it, may as well be random.

/s/ Adam