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On Mon, Jun 25, 2012 at 04:20:46PM +0100, Rob Kendrick wrote:
> On Mon, Jun 25, 2012 at 11:28:30AM -0300, Roberto Ierusalimschy wrote:
> > > On 25/06/2012 9.06, Enrico Colombini wrote:
> > > >But programs should compress better :-)
> > > 
> > > I take that back: of course it will have the same information content.
> > 
> > Encripted files have exactly the same information content of the
> > original, but usually they do not compress at all.
> 
> This is because it is important that your ciphertext is extinguishable
> from random data.  

Indistinguishable, obviously.  I think it's time I went home.

B.