http://cypherpunk-handbook.i2p/articles/openbsd.html
It's the SSH
standard used worldwide, being native and standard in all BSDs, macOS,
and even Windows/Windows Server. From routers, switches, and devices to
cloud services and hosting, they all use OpenSSH, which has
post-quantum cryptography by default since Abril 2022. 21 - Firewall pf is OpenBSD's very own firewall.