(Source: 38 North via Mike Barraclough)
A little after midnight, early on the morning of July 15, as most of the Korean peninsula slept, were North Korean spies up late listening to the radio?
This was the big question after a strange sequence of numbers was read out on a North Korean radio station. It sounded a lot like the coded messages previously used to relay instructions to spies during the Cold War and perhaps that was the point.
The broadcast began at 12:45am, according to the Joong Ang Ilbo.
“From now on, I will give review work for the subject of mathematics under the curriculum of a remote education university for exploration agents of the 27th bureau.”
It continued, “On page 459, question number 35, on page 913, question number 55, on page 135, question number 86, on page 257, question number 2,” and so on. It lasted for 14 minutes.[…]
The 38 North article also included YouTube clips of Korean numbers stations, including this one from South Korea (2011):