A former British spy chief says encryption of online communications is "very positive" for the country's national security interests despite the difficulties it poses for security services attempting to tackle militants.
British Prime Minister Theresa May has proposed tougher measures to tackle militants online activities after four attacks in Britain this year while Home Secretary Amber Rudd visited Silicon Valley earlier this month to demand tech companies step up their efforts.
Jonathan Evans, who ran Britain's MI5 spy service from 2007 until 2013, said that while encryption did make attacks harder to stop, it also helped to prevent criminals and even foreign governments from hacking private data.
"I'm not personally one of those who believes that we should weaken encryption ... whilst, understandably, there is a very acute concern about counter-terrorism, it's not the only national security threat that we face," he told BBC radio.
"The way in which cyberspace is being used by criminals and by governments is a potential threat to the UK's interests more widely... so encryption in that context is very positive."
Evans' views echo those of Robert Hannigan, the former head of eavesdropping spy agency GCHQ, who said in July that the government should work with companies for access to messages to ensure that systems were not weakened.
A suicide bomb at a pop concert in Manchester and three attacks in London which used cars to drive into pedestrians have killed 36 people in the last six months.
In addition to those attacks, the number of plots that have been thwarted in Britain has risen this year. Security services say they have thwarted 19 plots since June 2013, six in the last four months.
Police say three of the four attacks in Britain this year were inspired by Islamist ideology.
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