| 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.