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                Security Features in Java SE
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                Signing Code and Granting It Permissions
            
            
            Steps for the Code Signer
            
The code signer takes the following steps:
- Download and Try the Sample Application.
 - Create a JAR File Containing the 
Class File,
using the 
jar tool.
 - Generate Keys
 (if they don't already exist),
using the 
keytool -genkey command.
Optional Step Generate a certificate 
signing request (CSR) for the public key certificate,
and import the response from the certification authority (CA).
For simplicity (and since you are only pretending to be Susan Jones),
this step is omitted. See
Generating a Certificate Signing Request (CSR) for a Public Key Certificate
for more information.
 - Sign the JAR File, 
using the 
jarsigner tool and the private key.
 - Export the Public Key Certificate,
using the 
keytool -export command. 
Then supply the signed JAR file and the 
certificate to the receiver Ray.