Rings of steel combat net attacks
Many extortionists are targeting net-based betting firms and threatening to cripple their websites with deluges of data unless a ransom is paid.
But now deep defences are being put in place by some of the UK's biggest net firms to stop these attacks. Increasing numbers of attacks and the huge amounts of data being used to try to bump a site off the web are prompting firms to adopt the measures.
By Mark Ward at the BBC.
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