I need to authorize users not only by login/password but also by individual certificates. How can I create such certificates manually and configure SharePoint to prompt certificate for authorization and if there is no one then propmt login/password?
Please don't suggest ADFS. I know that I can use ADFS-server which can authorize by certificate, but it is not our case. I need simple solution: user enters site url and SharePoint automatically authorize user by certificate if it present (without extra clicks) or prompt login/password it it is not.