Begin quote from gnu@toad.com on Tue, 25 May 1993 15:27:27 -0700 From: gnu@toad.com (John Gilmore) Message-Id: <9305252227.AA27968@toad.com> To: kqb@whscad1.att.com, cypherpunks@toad.com, gnu@toad.com Subject: Re: Steganography and Steganalysis In-Reply-To: <9305252149.AA27051@toad.com> Date: Tue, 25 May 93 15:27:27 -0700 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?). ===================================================================== Trailing spaces, however, are likely to be changed by other sites: padded or cut. This might be a good idea if you used mime/PGP's radix-64 or uuencode or something similar. Kragen