The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Dev.java for updated tutorials taking advantage of the latest releases.
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Steps for the Contract Receiver

Now acting as Ruth, who receives the signed JAR file and the certificate file from Stan, perform the following steps.

1. Import the Certificate as a Trusted Certificate, using the keytool -import command.
2. Verify the JAR File Signature, using the jarsigner tool.