The Authority Revocation List is technical identical to a
CRL but used for CAs and not for end user
certificates.
`CRL'
The Certificate Revocation List is a list containing
certificates revoked by the issuer.
`Keygrip'
This term is used by GnuPG to describe a 20 byte hash value used
to identify a certain key without referencing to a concrete protocol.
It is used internally to access a private key. Usually it is shown and
entered as a 40 character hexadecimal formatted string.
`OCSP'
The Online Certificate Status Protocol is used as an
alternative to a CRL. It is described in RFC 2560.