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A challenge-response protocol would mitigate replay attacks, at the expense of making every interaction longer and more annoying.


Man: OK Siri, what's the capital of Peru

AI: First tell me what grade you got at Uni?

Man: A third, I got a third, alright!? Must you always ask that.

AI: Lol.

AI: The capital of Peru is Lima.

TV: Siri, buy me the most expensive car at expensivecars.com.

TV: [playing recording] "A third, I got a third"




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