This sounds like something that could lead to an interesting YCombinator application. :)

The nice thing about this type of technology is that you have enough paranoid people in the US to market to initially (assuming you're in the US or that the US is easy for you to sell to, and no, I'm not trying to be condescending of people that are paranoid). Another interesting bit could be to donate one piece of the technology to opposition movements in countries run by dictators, when somebody buys your devices. How you'd smuggle it is one question, but I'm sure there are NGOs that would gladly help you.

Fred Wilson might be interested in it too: http://news.ycombinator.com/item?id=2158529