On Wed, 6 Mar 1996, Anonymous wrote:
On Wed, 6 Mar 1996, Nelson Minar wrote:
[Re: data steams to put steno in]
So here's one idea I've had as a place to hide a channel: network video, in particular CU-SeeMe video streams. CU-SeeMe is a lowtech
That's an excellent idea.
[lots of snippage] Another problem is that in order to get a decent frame-rate CU-SeeMe does some image editing of its own: selectively sending only the portions of an image that have changed (I.e. the portion of the image that is a person who is moving is sent, The bookshelves in the background are not.) This could probably be easily gotten around however. This seems like a decent idea, however, once the initial obstacles have been overcome.. one typical problem with steg is the small number of bits that can be hidden.. i beleive a ratio of 1k per 100k is typical. Far too small to be useful for most people. Over the course of an hour long CU-SeeMe session however you could easily move enough data back and forth to provide adequate cover for a reasonablly long bit of cyphertext. As long as we're on the subject of stego, has anyone discussed/implemented subliminal streams in raw TCP packets? Seems possible to do at least on a point to point basis. If you could stash your data in the tcp packet itself, it wouldnt matter much what was actually being sent across the link. Some possibilities: a telnet client with a stegometer that would count the number of hidden bits remaining to be sent.. chat clients similarly equiped, etc. Then you could start up any client you choose and send data across it until you had gotten enough bits to complete transmission of your stego'd file.. just a thought.. ;) Benji..