
CDP repositories can either be an LDAP or
HTTP location. This example shows CDP
configuration if CRL access is to occur via
HTTP. The CDP information is included in
the certificate when it is issued by the
Certificate Authority.
Any client receiving a signed certificate
from this CA would use this CDP
information to access the CRL. The image
below provides another example of CDP
information, this time using LDAP.
There are advantages to using HTTP over
LDAP and vice versa. One of the
advantages of using LDAP as a repository is
the high availability of the CRL through
Active Directory replication to all domain
controllers in the forest. One of the
advantages of using HTTP is because it is
firewall friendly and typically doesn’t
require authentication. Many customers
configure both HTTP and LDAP methods of
access for redundancy and comfort level. Now that basic certificate revocation has been covered,
the next section will cover the Security Manager assessment behavior as it relates to CRL access.
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