It's the murkiest of worlds – and most cybercrimes go unreported. For the criminals, the money to be made is worth the risks. But how do they do it? One insider, Kate Fazzini, has broken ranks to reveal the world of digital fraud and corporate extortion. Will Pavia meets her.

A few months ago I received an alarming email from someone called Julian Diggle. Diggle claimed to have found a password I used for social media accounts on an adult website.

"You visited this website to experience fun," he wrote. He claimed to have hacked into my computer, taken control

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