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It's to the best of our knowledge. I'm Anne Strange Amps. Today, Alan Turing. If you used a computer, a tablet, or a smartphone today, well, there's one man you should thank.

British mathematician Alan Turing. He was one of the most original thinkers of the 20th century. His theories laid the foundation for artificial intelligence and the modern computer,

and he also helped save the world from Nazi domination by cracking the German Enigma Code.

And now, 60 years after his death, he's being celebrated on screen in a new biopic called

The Imitation Game.

All right, Mr. Turing, I'll bite. Why do you wish to work for his majesty's government?

I, I like solving problems, commander.

And Enigma is the most difficult problem in the world.

No, enigma isn't difficult, it's impossible.

Good.

Let me try, and we'll know for sure, won't we?

But there's a tragic side to Alan Turing's extraordinary life.

He was also persecuted for his homosexuality by British authorities.

And for that story, we turned to filmmaker Patrick Salmon.

His film, Codebreaker, explores Turing's suicide after his arrest in 1952.

Salmon says Turing was a victim of the paranoia and prejudice of the time.

One of the absurd things about the way Turing was treated

is that there was this Cold War paranoia

at this time in the early 50s

about the risk that so-called perverts

...