And to rule out computer bugs, independent groups verified the calculations using several different versions of the modelling software.

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The computer has a thousand bugs, all detailed for anyone to see online.

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The bugs can make a computer open to infection by viruses.

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When the latest version of Mozilla's Firefox was released in June, bugs that allowed a site to install malicious programs on a visitor's computer were reported to security vendor Tipping Point within hours.

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Unlike other challenges released by Overthewire, Natas focuses exclusively on exploiting web security bugs in servers, according to its creator, Steven Van Acker, a computer science graduate student at Katholieke Universiteit Leuven in Belgium.

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