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From KQED.

Thank you. From KQED in San Francisco, I'm Mina Kim.

Coming up on Forum, how a San Francisco software engineer stopped a massive cyber attack.

Cyber security experts are still trying to figure out who embedded malicious code into software

that's vital to running the internet. The so-called backdoor hack could have infected hundreds

of millions of computers worldwide and was only discovered because the programmer stumbled upon it while

doing routine work on his computer. The incident is everyone breathing a sigh of relief and

also realizing how much we rely on luck and volunteers to maintain the operating system that

runs most of the internet. We learn more after this news. Welcome to Forum. I'm Mina Kim.

A Microsoft engineer living in San Francisco is being credited with stopping a massive cyber

attack that could have affected hundreds of millions of computers worldwide.

And he did it inadvertently. Andres Freund was working on his computer when he noticed something

...