I know GitHub uses it for code development (not user authentication for the website though). I saw this article on the idea: http://neverfear.org/blog/view/3/Secure_website_authentication_using_GPG_keys
Is there a plugin or some open source code to authenticate users in a CMS (e.g. Drupal, Wordpress, Django, etc) with public-private key signatures?
Has anyone implemented this type of website authentication before?