Uno,zero,cinco,cinco,". Simmons says Cuba's intelligence agency still prefers short wave radios and face-to-face meetings over computers and more advanced technology.

VOA: standard.2009.06.06

Simmons say Havana has long relied on short wave radio to send encoded messages using a system that converts letters into numbers.

VOA: standard.2009.06.06

Authorities say the couple also used short wave radio to take orders from Havana and to transmit information.

VOA: standard.2009.06.06

He says unlike e-mail, the short wave transmissions are almost impossible to track.

VOA: standard.2009.06.06