DMCA has pushed me to my limit.

[Eugene Leitl]

On Wed, 18 Jul 2001, David Honig wrote:

> 1. encrypted data is indisttinguishable from uniformly distributed noise

Yes, but which natural data sources have that signature?

> 2. LSBs in digitizations of analog signals are noise

Not uniformly distributed noise, unfortunately. Perhaps somebody should
put hardware entropy generators mixing white noise into multimedia steam
LSBs. People should definitely package stegano decoys into Open Source
streaming multimedia warez.

> 3. ignoring the nuance of different LSB distributions, how can you
> distinguish a stego'd from unaltered file?

By running a simple statistical test (most packages don't even pad, so you
can vgrep for it). There is some pretty bulletproof stego out there, but
90% of it wouldn't stand a trace of scrutiny. Of course it limits the
processivity of the screening.

> Stego by itself is much less interesting than stego'd encrypted data
> (with idenntifying headers stripped of course)

The point of stego is not leaking the information that you're sending
other information.

> That spam, mp3, or image could be merely a transport for more privledged
> info.  Posting /reading to a public newsgroup solves traffic-analysis
> issues too.


-- Eugen* Leitl <a href="http://www.lrz.de/~ui22204/">leitl</a>
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