[68098] in Cypherpunks
Re: Stego via TCP/IP (was Re: crypto wish list)
daemon@ATHENA.MIT.EDU (Adam Shostack)
Tue Oct 15 21:53:46 1996
From: Adam Shostack <adam@homeport.org>
To: nelson@media.mit.edu (Nelson Minar)
Date: Tue, 15 Oct 1996 21:44:20 -0500 (EST)
Cc: cypherpunks@toad.com, aba@dcs.ex.ac.uk
In-Reply-To: <cpag23gjc4v.fsf@hattrick.media.mit.edu> from "Nelson Minar" at Oct 15, 96 02:49:52 pm
Nelson Minar wrote:
| What, a discussion of cryptography on the cypherpunks list?
|
| aba@dcs.ex.ac.uk (Adam Back) writes:
| >>Where is highly sophisticated stego?
| >What are our options?
| >- Stego in english text.
| >- Stego in audio and graphic file formats
| >- Stego in Internet Phone protocols.
| >- Stego in Internet video conference formats
|
| What about stego in IP itself? It's been awhile since I've looked, but
| aren't there some bits one could subvert in the TCP/IP headers themselves?
A bunch of must be zeros. Easy to see. A machine with two
interfaces could send data by choosing the interface to send on.
Ping, DNS, and ICMP all have lots of space for data.
Adam
--
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