When you catalog media that contains encrypted backup sets, Backup Exec attempts to find valid encryption keys for the sets in the Backup Exec database. If Backup Exec does not find a valid key, it issues an alert that instructs you to create one. After you create a valid key, you can respond to the alert to retry cataloging the encrypted set. Alternatively, you can skip the encrypted set and continue to catalog the rest of the media, or cancel the catalog job.