edit whoops, hit the reply link under the wrong comment. This was supposed to be a comment under "This is a prime example of a covert communication channel." I

edit whoops, hit the reply link under the wrong comment. This was supposed to be a comment under "This is a prime example of a covert communication channel." If anyone is interested in having more fun with this kind of stuff, take a look at Tor's pluggable transports[1], for example. A taste specimen of 'covert channels': * various 'have everything appear to be random TCP with no other marks' transports (+/- padded packet lengths, time intervals, etc.) * skype-look-alike transport * various-stuff-over-http-look-alike (html, etc) transport * a transport that imitates git's push/pull * a transport that, given enough 'permitted'/non-censored data, learns to imitate arbitrary protocols (learns and encodes them as regular expressions; some interesting and crazy CA madness) * etc. [1]: https://www.torproject.org/docs/pluggable-transports.html.en https://www.torproject.org/docs/pluggable-transports.html.en and https://trac.torproject.org/projects/tor/wiki/doc/PluggableTransports https://trac.torproject.org/projects/tor/wiki/doc/PluggableT...