Debian is using client-side SSL certs for SSO. I wonder why that isn&#x27;t more common on the Internet.<p><a href="https:&#x2F;&#x2F;wiki.debian.org&#x2F;DebianSingleSignOn" rel="nofollow">https:&#x2F;&#x2F;wiki.debian.org&#x2F;DebianSingleSignOn</a>