[8431] in cryptography@c2.net mail archive
Re: NONSTOP Crypto Query
daemon@ATHENA.MIT.EDU (David Honig)
Sat Jan 13 11:27:59 2001
Message-Id: <3.0.6.32.20010112164016.007e8c60@pop.sprynet.com>
Date: Fri, 12 Jan 2001 16:40:16 -0800
To: Ray Dillinger <bear@sonic.net>, John Young <jya@pipeline.com>
From: David Honig <honig@sprynet.com>
Cc: cryptography@c2.net
In-Reply-To: <Pine.LNX.4.21.0101121332370.30585-100000@bolt.sonic.net>
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At 01:37 PM 1/12/01 -0800, Ray Dillinger wrote:
>Hmmm. That sounds like a trick that could be brought up to
>date. If you get two sensitive microphones in a room, you
>[A quick contemplation of the wavelength of the sounds in question
>would put an end to that speculation I suspect. --Perry]
Maybe not, because you can use the click--- you look only at intensity
envelope, summing all frequencies essentially.
[Remember your basic science: you can't resolve something smaller than
half a wavelength. (Well, you can, with certain techniques, but things
get seriously hairy at that point, and in general the limit is half a
wavelength.) Given this, it is unlikely that you're going to figure
out whether the g or the h key was struck. If I'm wrong here, I'd like
to hear a detailed counterargument or evidence. --Perry]
