You use digitally signed beans from other people and organizations that you trust by reg istering their trusted certificates with the keystore file managed by the keytool Java security tool.
In Java 1.1, digitally signed beans were registered with an identity database that was managed by the javakey tool. These have been replaced by the keystore architecture and the keytool and jarsigner security tools in Java 1.2. The new digital signing architecture and tools are not backward compatible.
A certificate is a digitally signed statement that provides information about the person or organization that signed the statement. It also provides the value of the signer's public key.