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4- Astra
The actual name of this mysterious hacker has never been realized by authorities. However, according to information received from the Greek police Astra was a 58-year-old mathematician. Living in Athens at the time Astra had been conducting cyber-attacks since 2002. He is known popularly for hacking Dassault, a French military and aviation company. He spent the next 5 years stealing and selling sensitive information about aircraft and military technology to foreign countries. This attack cost the company over $360 million in damages. And led to a sentencing of 6 years in prison for Astra.