Less than an hour into a Tinder date in a Moscow restaurant last year, Patrick Wardle began to wonder about the laptop he'd left in his hotel room. Wardle had come to the city for a security conference; as a former NSA staffer who'd worked on the elite hacking unit known as Tailored Access Operations, he was paranoid enough to bring only a "burner" PC on his trip, carefully stripped of any sensitive information.

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