Use this guide to enable a SecureAuth IdP realm to utilize a Certificate Finder begin site.
At this begin site, SecureAuth IdP can search for a Java certificate and extract the user ID from it. From there, the end-user follows the SecureAuth IdP workflow configured in the realm (e.g. 2-Factor Authentication) without requiring to enter the user ID, and is asserted to the Post Authentication target.
SecureAuth IdP includes Certificate Finder V1 and Certificate Finder V2 begin sites. They perform the same functions; but Certificate Finder V2 includes a master page that alerts end-users that SecureAuth IdP is checking for a certificate and resembles the login page theme, whereas Certificate Finder V1 displays only a blank page.