No, the sky isn't falling, but Q Day is coming, and it won't be as expensive as thought.

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[–] 7 points 7 months ago

AES-256 is fine actually. The best known quantum attack reduces key strength from 256 bits to 254.4 bits. The problem is that in order to use AES (which is a symmetric encryption scheme) you need to exchange keys using an asymmetric system like RSA, which is known to be weak to quantum attacks.

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