Comments this week by UK prime minister David Cameron have re-ignited the debate about how to weigh individuals' online privacy against the needs of law enforcement to be able to detect and prevent crime.
"In our country, do we want to allow a means of communication between people, which even in extremis, with a signed warrant from the home secretary personally, that we cannot read?" said Cameron in a speech. "Up until now, governments of this country have said no, we must not have such a means of communication."

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