I don't trust ANYTHING on the internet to be secure in any way. Picture this: "Hey! Sign up here for secure encrypted email service", said the Federal Alphabet agency. I personally think that using a plain language, out in the open, backwards code would probably work better. For instance: Meet me at Midnight at the North end of Broad Street. I'll be in the White car. That would actually mean: Meet me at Noon at the South end of Broad Street. I'll be in the Black car. That way they'll be there 12 hours early, at the wrong end of town, looking for the wrong color car.