[12379] in cryptography@c2.net mail archive
Re: [IP] Master Key Copying Revealed (Matt Blaze of ATT Labs)
daemon@ATHENA.MIT.EDU (Derek Atkins)
Fri Jan 24 15:53:48 2003
X-Original-To: cryptography@wasabisystems.com
X-Original-To: cryptography@wasabisystems.com
To: Matt Blaze <mab@research.att.com>
Cc: Len Sassaman <rabbi@abditum.com>,
"Arnold G. Reinhold" <reinhold@world.std.com>,
cryptography@wasabisystems.com
From: Derek Atkins <derek@ihtfp.com>
Date: 24 Jan 2003 15:47:28 -0500
In-Reply-To: <200301242021.h0OKL0M17616@fbi.crypto.com>
The fact that the hole is on the bottom pin is not important. What is
important is that the hole at the change-key height does not need to
be at the same angular position as the hole at the master-key height.
It's hard to draw ascii art to show what I mean, but because the twist
holes are at a particular height when the key is inserted, you can
certainly see how at different heights the holes can be in different
locations.
-derek
Matt Blaze <mab@research.att.com> writes:
> Actually even in their Biaxial design the sidebar hole is always on the
> bottom pin, and so the master shares the angle with the change keys.
>
> -matt
>
> > There is, however, a newer medeco design that uses a drill-hole
> > instead of a groove. With that design you can have the pin twist be
> > different at different pin-heights (by putting the drill-hole at a
> > different twist-angle). I don't think this attack would work quite
> > as easily on this design.
> >
> > -derek
>
--
Derek Atkins
Computer and Internet Security Consultant
derek@ihtfp.com www.ihtfp.com
---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo@wasabisystems.com
