1993-05-25 - Re: Steganography and Steganalysis

Header Data

From: gnu (John Gilmore)
To: cypherpunks@toad.com, gnu
Message Hash: e667a292ab3c3d927408fea111a8a6a1a6ab99f9be54b953c50df2bc8ce39114
Message ID: <9305252227.AA27968@toad.com>
Reply To: <9305252149.AA27051@toad.com>
UTC Datetime: 1993-05-25 22:27:33 UTC
Raw Date: Tue, 25 May 93 15:27:33 PDT

Raw message

From: gnu (John Gilmore)
Date: Tue, 25 May 93 15:27:33 PDT
To: cypherpunks@toad.com, gnu
Subject: Re: Steganography and Steganalysis
In-Reply-To: <9305252149.AA27051@toad.com>
Message-ID: <9305252227.AA27968@toad.com>
MIME-Version: 1.0
Content-Type: text/plain

My favorite scheme was to encode messages in trailing spaces and/or tabs
in netnews messages.  You could also put internal tabs in place of spaces.

In fact, you could do this with news messages that flow "through" your 
site, (if the messages aren't protected with a crypto checksum), so that
you would not be the message's sender (and it wouldn't be addressed to anyone
either -- recipients get very good privacy).

This would be one way for a Unix "worm" program to report back to its
master...and/or receive instructions.

	John Gilmore

PS:  You could put short interesting stuff just in your message-ID's!
Not to mention the low order bits of timestamps (exactly *what* second
did it arrive, now?).