Whatever Happened To Isogenies?

WARNING: the SIKE algorithm is only for research purposes, insecure

And, so, isogenies looked to be the next great thing in cybersecurity in replacing ECDH for key exchange, and for us to move towards a post quantum world. For key sizes, it all looked great:

Type      Public key size (B)   Secret key size (B)  Ciphertext size (B)…