Where is this from?

The 1983 movie WarGames. This is the computer’s conclusion after simulating every possible outcome of Global Thermonuclear War.

I don’t know if we’re doing spoilers for 40+ year old movies, but

spoiler

Isn’t this really its conclusion after being told to play tic tac toe against itself? Then it learned from that and applied it to its global thermonuclear war simulations.

To be honest, I recognized the screenshot and know the summary of the movie but I haven’t actually seen it.

You should! Actually a pretty accurate depiction of hacking. He spends weeks war dialing every phone number in the range in order to hack the computer.

Story goes that Reagan got freaked out after watching the film and asked the chairman of the joint chiefs of staff if it’d be that easy to hack into the US military. After a week of looking into it came the answer: “no, the problem is much worse than that”, and fifteen months after having watched it signed the confidential directive “National Policy on Telecommunications and Automated Information Systems Security”, starting the implementation of cybersecurity measures in the country’s institutions.