I signed my applet using .pfx file. But when I run my web page it shows "UNKNOWN publisher warning".
I also have another certificate .cer (How to check that its a code signing certificate)[I got it from another person and he is also not sure].
So to sign applet, do I need special certificate say "Code Signing" certificate? Or I'm missing something?
A digital certificate that is generated by me or you will read UNKNOWN in that dialog. The reason is that if you can make a certificate claiming that you are you, I can just as easily make a certificate claiming that I am you.
In order to avoid lying to the end-user, Oracle just reports 'unknown' for those 'self signed' applications.
Get a code-signing certificate with a key-chain pointing back to a Certification Authority (who take steps to verify the identity claimed by the applicant - and overcharge to do it), and the dialog will show the author.
See also this answer to Signing a jar file with trusted certificate for JWS deployment for the intricacies of showing the author.
