A top US intelligence official has warned that encryption technologies used by terror groups have sped up by seven years because of Edward Snowden.
James Clapper, the director of national intelligence, said the development posed a problem for officials attempting to collect data on ISIS.
It comes after he also warned the group had underground cells in European countries including UK, Germany and Italy.
Mr Clapper, speaking during a meeting organized by the Christian Science Monitor, said: 'As a result of the Snowden revelations, the onset of commercial encryption has accelerated by seven years.'
He added: 'From our standpoint, it's not a good thing.'
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