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Which is partly why we wrote and open sourced a SIDH implementation in TLS 1.3: https://blog.cloudflare.com/sidh-go/

I <3 cloudflare, you guys are awesome!

Do you have any performance numbers for SIDH vs ECDHE?

Cloudflare has a Go implementation of SIDH with p751: https://blog.cloudflare.com/sidh-go/

Here’s an overview of the performance from a patch by Armando Faz Hernandez: https://github.com/cloudflare/p751sidh/pull/2