[11774] in cryptography@c2.net mail archive
Re: Real-world steganography
daemon@ATHENA.MIT.EDU (Adam Shostack)
Mon Sep 30 22:58:02 2002
Date: Mon, 30 Sep 2002 22:45:00 -0400
From: Adam Shostack <adam@homeport.org>
To: Paul Krumviede <pwk@acm.org>
Cc: Peter Gutmann <pgut001@cs.auckland.ac.nz>,
cryptography@wasabisystems.com, cypherpunks@lne.com
In-Reply-To: <252545881.1033414279@localhost>
On Mon, Sep 30, 2002 at 07:31:19PM -0700, Paul Krumviede wrote:
| --On Tuesday, 01 October, 2002 13:54 +1200 Peter Gutmann
| <pgut001@cs.auckland.ac.nz> wrote:
|
| >I recently came across a real-world use of steganography which hides extra
| >data in the LSB of CD audio tracks to allow (according to the vendor) the
| >equivalent of 20-bit samples instead of 16-bit and assorted other
| >features. According to the vendors, "HDCD has been used in the recording
| >of more than 5,000 CD titles, which include more than 250 Billboard Top
| >200 recordings and more than 175 GRAMMY nominations", so it's already
| >fairly widely deployed.
...
| i've seen comments in reviews of professional CD mastering
| gear that there are other, seemingly preferred, technologies,
| although i've never found details of them.
The two that spring to mind are HDCD and XRCD. I'd never dug into how
they're recorded, being much more interested in playing with things
closer to the output stage, like speaker resonance control and
electrical hum elimination...
Adam
--
"It is seldom that liberty of any kind is lost all at once."
-Hume
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