Abstract The Cuban Intelligence Service has a long record of broadcasting
encrypted numbers messages by shortwave radio to communicate with its
clandestine agents abroad. Although it is considered a secure way to
communicate covertly, there have been espionage cases where the use of this
type of communication provided hard physical evidence, resulting in criminal
complaints and convictions.
Keywords Cuba, Numbers Stations, cryptography, one-time pad, espionage,
“Atencion” radio station, Dirección General de Inteligencia (DGI), Cuban
Intelligence Service (CuIS), Federal Bureau of Investigation (FBI), Ana Belen
Montes, Carlos and Elsa Alvarez, Walter Kendall Myers, Gwendolyn Myers
Cipher Machines & Cryptology
© 2010 - 2012 D. Rijmenants
Cuban Agent Communications Failure of a Perfect System
Cuban “Numbers Station” Spy Broadcast From Last Week
V2 Cuban Atencion Station Schedule
Time Mon Tue Wed Thu Fri Sat Sun 0900 7527 7520 7482 7482 7527 7520 7887 7527 7520 7887 8136 1000 7681 7887 7862 7681 7887 7975 7975 7520 1800 8097 8097 8097 8097 1900 8097 8097 8097 2000 7887 7887 7887 7887 7887 7887 7887 2100 6855 6855 6855 6855 6855 6855 6855 6797 6797 2200 6797 6797 6797 6797 6797 6797 6797 It is speculated that there are broadcasts at 1800 and 1900 on Mon, Tues., and 1900 Fri., but there have not been any reports I have seen for these times. (Of course I could well have missed some reports.) My monitoring has confirmed most of these frequencies / times as well as the reports. All are in female, Spanish voice, AM; Call up is xxx xx for about 5 minutes, to 5 number sets, with a 3 second pause after every 10 sets of numbers. There does not seem to be a standard number of 5 number sets. (Although someone who counts better than me may dispute that.) Thanks to the many people who have monitored and reported to either Enigma200, Spooks list, or Spynumbers data base for this report including Mark S., Chris S., Tom H., Matthew F., and Don M. as well as others whom I may have missed.