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Trail: Security in Java 2 SDK 1.2
Lesson: Implementing Your Own Permission

## Steps for the TerrysGame Developer (Terry)

> The steps Terry would take, after creating a game (`TerrysGame` ) that calls the `HighScore` `getHighScore` and `setHighScore` methods to get and set, respectively, the user's high scores, are:

### Compile the Game Class

>     javac TerrysGame.java -classpath hs.jar -d .

### Place its class file in a JAR File

>     jar cvf terry.jar com/gamedev/games/TerrysGame.class

### Create a Keystore and Keys for Signing

>     keytool -genkey -keystore terry.keystore -alias signTJars

> Specify whatever you want for the passwords and distinguished name information.

### Sign the JAR File

>     jarsigner -keystore terry.keystore terry.jar signTJars

### Export the Public Key Certificate

>     keytool -export -keystore terry.keystore
>         -alias signTJars -file Terry.cer

### Supply Files and Information Needed by Users

> That is, supply them
> - the signed JAR File `terry.jar,`

> - the public key certificate file `Terry.cer`, and

> - information as to the permissions the `TerrysGame` class needs. For this, Terry could supply the exact grant entry needed.
> Game users also need files and information from Chris. For their convenience, Terry may forward this information to them:
> - the signed JAR File `hs.jar`,

> - the public key certificate file `Chris.cer`, and

> - information as to the permissions the `HighScore` and `HighScorePermission` classes must be granted in a policy file in order to work. This could be the exact grant entry needed.

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