Clever Cryptography Could Save Privacy in Covid-19 Contact-Tracing Apps

Before the Covid-19 pandemic, any system that used smartphones to track locations and contacts sounded like a dystopian surveillance nightmare. Now, it sounds like a dystopian surveillance nightmare that could also save millions of lives and rescue the global economy. The paradoxical challenge: to build that vast tracking system without it becoming a full-on panopticon.Since…

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