title: Identifying an AES encrypted file
body: <p>Is there a way to identify or inspect an AES encrypted file based on the file content (like the way a ZIP file can be identified by looking for letters "PK" at the beginning of the file)? Is there any magic number associated with AES encrypted files?</p>
  
  <p>We have multiple files in the workflow repository that are either in plain text (could be excel, XML, JSON, text etc.) or AES-256 encrypted and don't have an idea which ones are AES encrypted. I need to write Java code to identify the AES encrypted files and decrypt them automatically. Thanks!</p>