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Supersingular isogeny Diffie–Hellman key exchange (SIDH) has post-quantum keys comparable to current RSA keys.

It seems limited to DH key exchange with it's favorable properties, however...

It’s downside is that it is computationally very expensive. All of the other NIST candidates are not very computationally demanding, but have much larger keys. So the trade off with SIDH is that it spends a lot of time calculating while the others are transmitting bytes over the network. There are trade offs with all the proposed schemes. a

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