http://www.spammimic.com/encode.cgi supposedly encodes your short messages as imitation spam, postings designed to fail content filtering & so (the author claims) bypass Echelon. Hmmm. Whoever put the site up doesn't seem to have a clear distinction between cryptography, stenography & obfuscation. Does everyone have to reinvent the wheel every time? Are we going to go through it all *again* with mobile phone text messages? It seems to be a version of Peter Wayner's bumf generator from way back when: http://catless.ncl.ac.uk/Risks/11.71.html#subj2 (Which has a very funny bit in the style of a Neil Kinnock speech - maybe you have to be in the Labour Party to get it...) I don't think it is going to cause NSA any headaches. What chance do they have of knowing about a method which has only been described in Byte and on Risks? Presumably if you identify a posting as having been through Mimic & you can get enough text to recover the model you can retrieve plaintext reasonably easily - so the secure use should be based on ciphertext, not plaintext & perhaps would avoid using models freely available on the web. (there was some discussion on similar stuff on coderpunks & cypherpunks a few years back) http://privacy.nb.ca/cryptography/archives/coderpunks/new/1998-03/0214.html But it generates mildly amusing parodies of spam. Not as good as the Neil Kinnock though. Ken Brown "You will shortly be in communication with Otis" translates to: Dear E-Commerce professional , Your email address has been submitted to us indicating your interest in our briefing . If you are not interested in our publications and wish to be removed from our lists, simply do NOT respond and ignore this mail . This mail is being sent in compliance with Senate bill 2516 , Title 1 , Section 303 . This is not multi-level marketing ! 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