What you think of is a covert channel [1]. There is a bunch of them, bu check out iodine [2] [1] http://en.wikipedia.org/wiki/Covert_channel http://en.wikipedi

What you think of is a covert channel [1]. There is a bunch of them, bu check out iodine [2] [1] http://en.wikipedia.org/wiki/Covert_channel http://en.wikipedia.org/wiki/Covert_channel [2] http://code.kryo.se/iodine/ http://code.kryo.se/iodine/