How North Korea, one of the world's poorest countries, got so good at hacking

Even before a US government investigation confirmed suspicions that North Korea was behind the massive cyberattack on Sony Pictures, everybody has seemed to be asking the same question about even the possibility of North Korean responsibility. Can one of the poorest countries in the world, a country that has isolated itself into technological backwardness, where personal computers are banned and the Internet does not officially exist, possibly be that good at hacking?

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