XLRSecTool helps creating either self-signed certificates or trusted CA (Certificate Authority).
Once the certificate issued, you may sign your documents (JAR or XLR), applications, and applets (for use with SUN's JavaPlugin)
The appli contains a step-by-step help to create your trusted certificate issued by Thawte or Verisign certificate authorities. XLRSecTool for Linux is a freeware categorized in security software.