[12970] in cryptography@c2.net mail archive
aural cryptography
daemon@ATHENA.MIT.EDU (John Kelsey)
Tue Apr 8 12:16:45 2003
X-Original-To: cryptography@wasabisystems.com
X-Original-To: cryptography@wasabisystems.com
Date: Tue, 08 Apr 2003 11:50:46 -0400
To: cryptography@wasabisystems.com
From: John Kelsey <kelsey.j@ix.netcom.com>
Guys,
I was re-reading the original visual cryptography paper last night, and had
an odd thought: Why couldn't we do something similar with sounds? The
human ear/brain is pretty good at pulling patterns out of noise; would it
be possible to randomly embed half of a low-quality voice channel in each
of two sound channels, so that they didn't sound obviously bad apart, but
when played at the same time, would allow the listener to hear a spoken
message pretty clearly?
It seems like you could even do some pretty weird things with this, like
embedding the signal in four or five sound channels, or embedding them in
such a way that the speakers on the different channels had to be a certain
distance apart for the embedding to work.
So my questions are:
a. Is this really possible? Or am I missing something?
b. Has this been done in the open literature? (It seems like the sort of
thing that would have been really useful for, say, radio broadcasts that
were intended to be received by spies.)
Thanks,
--John Kelsey, kelsey.j@ix.netcom.com
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