Nobody has something that would fulfill your caveat, with the possible exception of a few larger countries. If you are the named target of the NSA, they will find a way into your communications.

This war really has little to do with find the way into a named person's communications; it has much more to do with finding the names of people whose communications they want to see.

For that, iMessage is devastating (assuming it is implemented and behaves as marketed, a pretty big assumption).