Stego via TCP/IP (was Re: crypto wish list)

[Adam Shostack]

Nelson Minar wrote:
| What, a discussion of cryptography on the cypherpunks list?
| 
| aba at 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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