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Chinese scientists hack military grade encryption on quantum computer: paper (www.scmp.com)

submitted 1 month ago by floofloof@lemmy.ca to c/technology@lemmy.world

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[–] frezik@midwest.social 1 points 1 month ago (1 children)

The article says they hit AES, which doesn't make much sense. Block ciphers aren't vulnerable to QC in the same way as public key crypto. Even so far as Grover's Algorithm would help at all, it's far from being practical.

[–] theterrasque@infosec.pub 1 points 1 month ago

In many cases the key exchange (kex) for symmetric ciphers are done using slower asymmetric ciphers. Many of which are vulnerable to quantum algos to various degrees.

So even when attacking AES you'd ideally do it indirectly by targeting the kex.