If you have ever been searching the short-wave band...have you ever came accross strange stations that constantly spout out random numbers at given intervals?

If you have you may have come accross one of many numbers stations, believed to be operated by government intelligence agencies. these broadcasts are clandestine and are 'unofficial'. MI6 are believed to be broadcasting a couple of these numbers stations from an RAF base in cyprus, and the broadcasts are believed to be aimed at the middle east. It is pretty obvious that joe public isn't really supposed to know about these broadcasts. Check it out for yourself.
 http://www.simonmason.karoo.net/page30.html
 http://www.ryan-silva.com/muzak/