openssh-sk-provider for Mac

openssh-sk-provider is a standalone FIDO2 security key provider for system OpenSSH, delivered as a command-line tool. It addresses the problem of using hardware security keys in SSH authentication: by connecting FIDO2 devices to OpenSSH's authentication flow, it enables login or signing operations to be completed with a physical key rather than relying solely on passwords or private key files stored on disk. It suits users who need to strengthen credential security in server logins, remote operations, or automation scripts, especially administrators and developers already using OpenSSH who want to introduce hardware-key-based two-factor or multi-factor authentication. It does not change how OpenSSH itself is used; instead, it fills in the security key component within its existing framework.