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                Packaging Programs in JAR Files
            
            
            Signing and Verifying JAR Files
            
You can optionally sign a JAR file with your electronic "signature." 
Users who verify your signature can grant your JAR-bundled software 
security privileges that it wouldn't ordinarily have. Conversely, 
you can verify the signatures of signed JAR files that you want to use.
This lesson shows you how to use the tools provided in the 
Java™ Development Kit to sign and 
verify JAR files:
If you're not familiar with the concepts of signing and verification, 
this section will help to bring you up to speed.  It contains definitions 
of the relevant terms, explanations of some of the benefits provided by 
signing, and an outline of the signing mechanism used by the Java platform 
as it relates to JAR files.
In this section, you'll learn how to use the 
JDK™ tools to digitally 
sign your JAR files.
This section shows you how to use the JDK tool set to verify 
signed JAR files.