Hack Attack, a game for the Commodore 64, dealing with the topic secret networks on earth.
>It has been nearly two years since the first disclosures of government surveillance programs by former National Security Agency contractor Edward Snowden and citizens around the globe are still coming to terms with how they feel about the programs and how to live in light of them. The documents leaked by Snowden revealed an array of activities in dozens of intelligence programs that collect data. The documents further detail the collection of Web traffic around the whole planet.
[..]Numbers stations (or number stations) are shortwave radio stations of uncertain origin. In the 1950s, Time magazine reported that the numbers stations first appeared shortly after World War II and were using a format that had been used to send weather data during that war.