The publisher for certificates for Java2D, 3D, and other Java libraries should read "Sun Microsystems, Inc." (note capitalization and punctuation) instead of "sun microsystems, inc". The latter looks unprofessional and can turn users off from accepting certificates since it looks like it could be a phishing scam.

The signing certificate is located here: /net/mizu/usr/re/home/java_re/keydir/latest/ -- which is the same certificate used to sign Java 3D and presumably more of the Java core given its location in the file system. 

You can bring the dialog up by launching the NASA world wind demo (also see attached): http://worldwind.arc.nasa.gov/java/demos/