| Name | Description | 
| digestMismatch | A digital signature of the update does not match. 
 | 
| keyExpired | A public key to verify the update is expired. 
 | 
| keyNotFound | The integrity can not be verified since a public key to
  verify the update cannot be found. 
 | 
| keyRevoked | A public key to verify the update has been revoked. 
 | 
| notEnoughSignatures | Not enough signed signatures on the update. 
 | 
| validated | The update is successfully validated. 
 | 
| validationError | The integrity validation failed. 
 |