i've created a self signed CA with DSA using OpenSSL and created a .der file using x509 of openSSL. I can create user certificate requests, verify them and create user certificates. can create signature and verify them also. but what to do with the .der file? i can do all the above things with .cert or .pem files. .der supposed to be shown side to the browser address bar. how to install that?
i'm using PHP and Apache.