From ArsTechnica:

Original poster by James White for WarGames, with additions by Sean Gallagher
“Let’s play Global Thermonuclear War.” Thirty-two years ago, just months after the release of the movie WarGames, the world came the closest it ever has to nuclear Armageddon. In the movie version of a global near-death experience, a teenage hacker messing around with an artificial intelligence program that just happened to control the American nuclear missile force unleashes chaos. In reality, a very different computer program run by the Soviets fed growing paranoia about the intentions of the United States, very nearly triggering a nuclear war.

The software in question was a KGB computer model constructed as part of Operation RYAN (РЯН), details of which were obtained from Oleg Gordievsky, the KGB’s London section chief who was at the same time spying for Britain’s MI6. Named for an acronym for “Nuclear Missile Attack” (Ракетное Ядерное Нападение), RYAN was an intelligence operation started in 1981 to help the intelligence agency forecast if the US and its allies were planning a nuclear strike. The KGB believed that by analyzing quantitative data from intelligence on US and NATO activities relative to the Soviet Union, they could predict when a sneak…

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