Deep underground somewhere in south-east England, security experts have built a data hosting center almost entirely based on open source operating systems. The cryptologists at the Bunker, an ex-Nato anti-nuclear hideout owned by a data hosting group also known as the Bunker, are so confident of good security, that they say they have no need for firewalls – the tools commonly used for keeping hackers away.

"We secure each system for its services rather than relying on firewalls to do that," says Adam Laurie, technical director at the Bunker. "We will use [firewalls] now and then but they are open source – if customers request them and if we're involved with the design process."

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