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@EdwinG
> Unfortuantely, for communications captured before the switch, when quantum computers will be able to break such large numbers
... if they ever get powerful enough to crunch numbers above 21. I suspect that like fusion energy, quantum computing will be 20 years away forever. A mirage on an ever-retreating horizon.
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But if you really want to freak yourself out with potential but inherently uncertain quantum computing futures, watch Alex Garland's 2020 mini-series Devs.