Encrypted email biz ProtonMail has open-sourced the code for its iOS app, having pre-emptively paid for a code audit that says there’s nothing wrong with it. Having touted itself for years as the choice of political activists, journalists, dissidents and all the other types of people who make the world a better place, ProtonMail is throwing some of its virtual doors open to convince a largely sceptical world to get with the programme.

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