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This paper has made me significantly increase my estimate of the urgency of moving to post-quantum crypto algorithms. Which really pisses me off because I spent a long time learning about elliptic curves, and soon all that knowledge will be useless. Damn those physicists.

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

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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