He says only secret nummbers can activate the nukes.
http://www.youtube.com/watch?v=PvN0k7wbX0Q&feature=player_detailpage#t=1s
Interview with Javaid Ch.
http://www.youtube.com/watch?v=wDiZtKYJvYo&feature=player_detailpage#t=1s
http://www.youtube.com/watch?v=PvN0k7wbX0Q&feature=player_detailpage#t=1s
Interview with Javaid Ch.
http://www.youtube.com/watch?v=wDiZtKYJvYo&feature=player_detailpage#t=1s