[136033] in cryptography@c2.net mail archive
Re: combining entropy
daemon@ATHENA.MIT.EDU (John Denker)
Fri Oct 24 08:36:24 2008
Date: Fri, 24 Oct 2008 05:29:36 -0700
From: John Denker <jsd@av8n.com>
To: IanG <iang@systemics.com>
CC: Cryptography <cryptography@metzdowd.com>
In-Reply-To: <48E0C673.6040005@systemics.com>
On 09/29/2008 05:13 AM, IanG wrote:
> My assumptions are:
>
> * I trust no single source of Random Numbers.
> * I trust at least one source of all the sources.
> * no particular difficulty with lossy combination.
> If I have N pools of entropy (all same size X) and I pool them
> together with XOR, is that as good as it gets?
Yes.
The second assumption suffices to prove the result,
since (random bit) XOR (anything) is random.
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