Message-ID: <3F3C9523.7090903@cyberone.com.au>
Date: Fri, 15 Aug 2003 18:09:07 +1000
From: Nick Piggin <piggin@cyberone.com.au>
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To: "David S. Miller" <davem@redhat.com>
CC: Andries Brouwer <aebr@win.tue.nl>, val@nmt.edu, daw@mozart.cs.berkeley.edu,
       linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH] Make cryptoapi non-optional?
References: <20030809173329.GU31810@waste.org>	<20030813032038.GA1244@think>	<20030813040614.GP31810@waste.org>	<20030814165320.GA2839@speare5-1-14>	<bhgoj9$9ab$1@abraham.cs.berkeley.edu>	<20030815001713.GD5333@speare5-1-14>	<20030815093003.A2784@pclin040.win.tue.nl> <20030815004004.52f94f9a.davem@redhat.com>
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David S. Miller wrote:

>On Fri, 15 Aug 2003 09:30:03 +0200
>Andries Brouwer <aebr@win.tue.nl> 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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