Trail: Security Features in Java SE
Lesson: Signing Code and Granting It Permissions
Section: Steps for the Code Signer
Create a JAR File Containing the Class File
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Signing Code and Granting It Permissions
Steps for the Code Signer
Download and Try the Sample Application
Create a JAR File Containing the Class File
Generate Keys
Sign the JAR File
Export the Public Key Certificate
Steps for the Code Receiver
Observe the Restricted Application
Import the Certificate as a Trusted Certificate
Set Up a Policy File to Grant the Required Permission
Start Policy Tool
Specify the Keystore
Add a Policy Entry with a SignedBy Alias
Save the Policy File
See the Policy File Effects
Next, create a JAR file containing the Count.class file. Type the following in your command window: 
jar cvf Count.jar Count.class
This creates a JAR file, Count.jar, and places the Count.class file inside it.
Previous page: Download and Try the Sample Application
Next page: Generate Keys