> Or if someone who worked for 411 or a hacker changed the number for the naval base to be one they controlled. Dave could be the CEO of 411 for all I know.

Agreed. A couple of ideas for better authenticating the NSA boogeyman.

1. Verify the number in a phone book.

2. Call a friend and ask them to follow the 411 protocol.

3. Drive to a hotel in a different state then follow the 411 protocol.

4. Overnight a cell phone to the NSA headquarters and wait for Dave to call you from it.

5. Call the FBI and ask them for the NSA number.