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There's nothing terribly new in this report about shortwave "numbers" stations, but the accompanying video does contain some interesting stock footage as it tells the story behind these mystery broadcasters.
Incredibly, with all the improvements in communications - satellites, the web, TV and more - using shortwave to transmit a series of mostly impenetrable numbers is still considered one of the safest ways to get an encrypted message to someone in the field - and it's said to be virtually uncrackable.
How Spies Communicate Using Shortwave Numbers Stations
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CTV takes a look back - and forward - to the use of shortwave to try and spread the truth to Russians about what's really going on in Ukraine. A video piece that actually highlights the usefulness of an old technology - radio - that rarely gets mentioned on television.
How shortwave radio is resurfacing as a tool in Ukraine