|  | 101 | 
            
              | Registration submission |  
              | Submission of information for registration. |  | 
        
          |  | 102 | 
            
              | Asymmetric key pair request |  
              | Request a trusted party to generate an asymmetric key pair. |  | 
        
          |  | 110 | 
            
              | Certification request |  
              | Request certification of credentials and public key. |  | 
        
          |  | 111 | 
            
              | Certificate renewal request |  
              | Request to extend the validity period of the current valid key, whose certificate is about to expire. |  | 
        
          |  | 112 | 
            
              | Certificate replacement request |  
              | Request to replace the current certificate by a new one with a different public key (and possibly other information). |  | 
        
          |  | 121 | 
            
              | Certificate (path) retrieval request |  
              | Request the delivery of an existing (valid or revoked) certificate, with path details where appropriate. |  | 
        
          |  | 123 | 
            
              | Certificate list retrieval request |  
              | Request full or partial list of certificate. |  | 
        
          |  | 124 | 
            
              | Certificate status request |  
              | Request current status of a given certificate. |  | 
        
          |  | 125 | 
            
              | Certificate validation request |  
              | Request the CA to validate an existing certificate. |  | 
        
          |  | 126 | 
            
              | Certificate delivery request |  
              | Request the CA to deliver a (valid or revoked) certificate to a list of recipients known to the CA or specified elsewhere. |  | 
        
          |  | 130 | 
            
              | Revocation request |  
              | Request revocation of a party's certificate. |  | 
        
          |  | 131 | 
            
              | Alert request |  
              | Request to put a party's certificate on alert. |  | 
        
          |  | 140 | 
            
              | Revocation list request |  
              | Request full or partial list of revoked certificates. |  | 
        
          |  | 150 | 
            
              | Symmetric key request |  
              | Request the delivery of symmetric keys. |  | 
        
          |  | 151 | 
            
              | Symmetric key discontinuation request |  
              | Request discontinuation of symmetric key. |  | 
        
          |  | 152 | 
            
              | Asymmetric key discontinuation request |  
              | Request discontinuation of asymmetric key. |  | 
        
          |  | 221 | 
            
              | Certificate delivery |  
              | Delivery of an existing (valid or revoked) certificate. |  | 
        
          |  | 222 | 
            
              | Certificate path delivery |  
              | Delivery of a path. |  | 
        
          |  | 224 | 
            
              | Certificate status notice |  
              | Notice of current status of a given certificate. |  | 
        
          |  | 225 | 
            
              | Certificate validation notice |  
              | Notice of validation of an existing certificate. |  | 
        
          |  | 231 | 
            
              | Revocation confirmation |  
              | Confirmation of revocation of a party's certificate. |  | 
        
          |  | 251 | 
            
              | Symmetric key delivery |  
              | Delivery of symmetric keys. |  | 
        
          |  | 252 | 
            
              | Discontinuation acknowledgement |  
              | Acknowledgement of the requested discontinuation. |  |