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Date: Tue, 05 Apr 2011 22:31:54 +0200
From: Yves-Alexis Perez <corsac@...ian.org>
To: oss-security@...ts.openwall.com
Subject: Re: A new way of writing secure data backups,
 combining RAID and one time pads.

On mar., 2011-04-05 at 19:13 +0200, klondike wrote:
> El 05/04/11 07:17, Gareth Randall escribió:
> > Hi,
> >
> > I have published a free software project called "Triplyx", which
> > writes data to a set of three storage devices in such a way that if
> > any one of them is lost or stolen, it cannot be used to recover the
> > data. Any two storage devices can be brought together to recover the
> > data. It was created for use with offsite data backups.
> >
> > The concept is simple, although I have never seen it done in a
> > commercial or open source product.
> Well long ago I tried to make a similar thing to divide a private key so
> a x out of the n people allowed to see the document could recover the
> data, the problem is that although the solution was trivial for small
> numbers it started getting complex as the n increased. 

That looks just like Secret Sharing, for which there exist
implementations, like Sham's Secret Sharing Scheme
http://point-at-infinity.org/ssss/ which you might find helpful.

Regards,
-- 
Yves-Alexis

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