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You'll just have to upgrade to supersingular elliptic curve isogenies! https://en.wikipedia.org/wiki/Post-quantum_cryptography#Supe...

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Cool, but do they work for signatures?

No idea if there are production-ready implementations, but in theory, yes. https://en.wikipedia.org/wiki/Supersingular_isogeny_key_exch...

Microsoft seems to have a github repo with the algorithm.

https://github.com/Microsoft/PQCrypto-SIDH

That's still the key exchange code, and not the signature. Microsoft hasn't released any code related to the SDVS extended by SIDH papers linked to the Wikipedia page, because the papers aren't by Microsoft.

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