The sixth annual Insomni'hack ethical hacking competition, organised by IT security firm SCRT, drew over 300 hackers who battled for hours to solve a range of fiendish computer security challenges.
"This is essentially to have fun and learn," 32-year-old Oriol Carreras from Barcelona told AFP. He hopes Seoul and Moscow -- hotbeds of hacking on both sides of the law -- might be the location for future competitions.
Attendees faced "about 30 tests in almost all security areas", SCRT founder Paul Such told AFP.
This year saw participants from Ukraine, Spain, Germany, France and other countries. Three of the best hacking teams in the world were present, including the winners of another famed competition, "Dragon Sector", who are mostly from Poland.
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"Our core business activity is ethical hacking, which means testing companies' security lapses and using the same tricks that ill-intentioned hackers would use, with the difference that we work under contract," said Such.
"If you are a company that markets software, opens a website and a hacker shows you a hole he found in your product, you will pay him," added Such.
The revelations leaked by former US National Security Agency contractor Edward Snowden last year that governments were breaking into Internet companies on a massive scale has only boosted the demand for "ethical hackers" who can help build stronger protections.