I recently encountered a problem related to Adobe's certificate, the details are here: http://groups.google.com/group/mozilla.support.firefox/browse_thread/thread/6f4beb5418f0f2e9 . After discussion it comes to that Adobe's certificate is added to my system's untrusted list, and I'm certain that I didn't do that myself, so I wonder whether it has truly been revoked or not (Windows seems do not distinguish between revocation and blacklist). Is there a place to check a certificate's revocation status? If it is not revoked, how can I determine who or which program did it? The certificate concerned is used to sign adobe flash player, with the fingerprint sha1: fd f0 1d d3 f3 7c 66 ac 4c 77 9d 92 62 3c 77 81 4a 07 fe 4c .