In March of this year, Meredith Whittaker was at her kitchen table in Paris when Signal, the encrypted messaging service she runs, suddenly became an international headline . A colleague sent their group chat the story ricocheting across the globe: “The Trump Administration Accidentally Texted Me Its War Plans.”

Of course, you know the rest: In the piece, The Atlantic’s editor in chief, Jeffrey Goldberg, detailed how he’d been added to a Signal chat about an upcoming military operation in Yemen. Over the following days and weeks, the incident would become known as “ SignalGate ”—and created a legitimate risk that the fallout would cause people to question Signal’s security, instead of pointing their fingers at the profoundly dubious op-sec of senior-level Trump officials.

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