> But even then if Joe and Bill suddenly got smarty-pants and started encrypting their communication - NSA would get suspicious and will find out what you guys

> But even then if Joe and Bill suddenly got smarty-pants and started encrypting their communication - NSA would get suspicious and will find out what you guys are up to via other channels. Unless everyone used encrypted email. And the only way to achieve that is to make it really easy to use, i.e. to have a zero user interface, so the program automatically encrypts it on the way out and automatically decrypts it on the way in. Key distribution can be handled by putting the public key in the header. The only drawback is this is vulnerable to man-in-the-middle attacks.