[SFDXA] The spooky world of the 'numbers stations'

[Bill]

 From Tony N2MFT

This is the era of hyper-tech espionage, encrypted emails and 
mindboggling cryptography. But you can hear a very old-fashioned form of 
espionage on shortwave radio.

The spooky world of the 'numbers stations' This is the era of hyper-tech 
espionage, encrypted emails and  mind-boggling cryptography.
But you can hear a very old-fashioned form of espionage on shortwave radio.

http://www.bbc.com/news/magazine-24910397