The seven biggest cybercrimes in history

4. Michael Calce

15 year-old Michael Calce, better known as MafiaBoy, gained notoriety in 2000 by hacking computers with high-level security, including Dell, Yahoo, Amazon and eBay. While in high school, Calce decided to unleash a DdoS attack on high-profile websites, the resulting damage of which was $1.2bn, not including his attacks on nine of of 13 root name servers. One of his most famous achievements is taking down Yahoo for an entire hour.

Although he was later apprehended, Calse was only sentenced to eight months in open custody due to his age. His online access was also restricted. Calce later became a columnist and has published a book about his ordeal.

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