there are some methods:
1. use openssl such as:
openssl genrsa -out /etc/httpd/conf/ssl.key/myserver.net.key 1024
openssl req -new -key /etc/httpd/conf/ssl.key/myserver.net.key -out /etc/httpd/conf/ssl.csr/myserver.net.key.csr
openssl req -new -key /etc/httpd/conf/ssl.key/myserver.net.key -x509 -out /etc/httpd/conf/ssl.crt/myserver.net.crt -days 999
2. install crypto-utils
sudo /usr/bin/genkey linuxdict.com –days 1024
follow the instruction, very simple, isn’t it ?
Then you can use your own cert for your application such as apache,postfix and so on.