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

## Export the Public Key Certificate

> You now have a signed JAR file `sContract.jar`. Clients wanting to use the file will want to authenticate the signature. In order to do so, they need the public key corresponding to the private key used to generate the signature. You supply this by sending them a copy of the certificate containing the public key. Copy that certificate from the keystore `stanstore` to a file named `StanSmith.cer` via the following:

> >     keytool -export -keystore stanstore -alias signLegal -file StanSmith.cer

> You will be prompted for the store password (`balloon53`).

> Given that certificate and the signed JAR file, a client can use the `jarsigner` tool to authenticate your signature, as you will see next.

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