Lockr

Lockr is a simple-to-use plugin for WordPress or Drupal to manage your site’s API and Encryption keys in a secure offsite hosted environment. Lockr removes the key from your site code and database and stores it in a secure and certified key manager. Then when your site needs the key to be used in an encryption/decryption or API request, Lockr will use secure certificate provided by the server to authenticate and release the key.