Typically the offload device used for servers is faster and more generically called an HSM. Yubico sells one called YubiHSM.
I wonder what the throughput on this is, I’m betting it’s nowhere close to what’s needed to actively run an internet facing HTTPS server that regularly interacts with the public. Still a totally cool hack though!
YubiHSM is the Yubico answer to this, but it’s quite expensive(but almost free compared to most HSM devices).
Yeah I’m wondering how many signing requests per second it can do and how that compares to HSMs. HSMs are still really slow though…