Hell, you could say the key is head -c `wc -c secret_file` /dev/urandom and they wouldn't be able to argue. It's turtles all the way down if they ask you to dec

Hell, you could say the key is head -c `wc -c secret_file` /dev/urandom and they wouldn't be able to argue. It's turtles all the way down if they ask you to decrypt the result.