Re: [RFC][PATCH] Make cryptoapi non-optional?

[Nick Piggin]

David S. Miller wrote:

> On Fri, 15 Aug 2003 09:30:03 +0200
> Andries Brouwer <aebr@xxxxxxxxxx> wrote:
>
>
> > On Thu, Aug 14, 2003 at 06:17:13PM -0600, Val Henson wrote:
> >
> >
> > > entropy(x) >= entropy(x xor y)
> > > entropy(y) >= entropy(x xor y)
> > Is this trolling? Are you serious?
>
> These lemma are absolutely true.  XOR is the worst way
> to gain entropy because it means that if you are able
> to know anything about either 'x' or 'y' then you are
> able to know something about the resulting entropy.

_Either_ x or y? Surely not! 1 ^ ? = ? you still have 1
bit of entropy.

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