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Trail: Security in Java 2 SDK 1.2
Lesson: Exchanging Files

## Sign the JAR File

> Now you are ready to sign the JAR file.

> Type the following in your command window to sign the JAR file `Contract.jar`, using the private key in the keystore entry aliased by `signLegal`, and to name the resulting signed JAR file `sContract.jar`:

> >     jarsigner -keystore stanstore -signedjar sContract.jar
> >         Contract.jar signLegal

> (Type all that on one line.)

> You will be prompted for the store password (`balloon53`) and the private key password (`cat876`).

> The `jarsigner` tool extracts the certificate from the keystore entry whose alias is `signLegal` and attaches it to the generated signature of the signed JAR file.

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