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Title : OCSP Extensions to IKEv2
Author(s) : M. Myers, H. Tschofenig
Filename : draft-myers-ikev2-ocsp-04.txt
Pages : 16
Date : 2006-9-19
While IKEv2 supports public key based authentication (PKI), the
corresponding use of in-band CRLs is problematic due to unbounded
Certificate Revocation List (CRL) size. The size of an Online
Certificate Status Protocol (OCSP) response is however well-bounded
and small. This document defines the "OCSP Content" extension to
IKEv2. A CERTREQ payload with "OCSP Content" identifies zero or more
trusted OCSP responders and is a request for inclusion of an OCSP
response in the IKEv2 handshake. A cooperative recipient of such a
request responds with a CERT payload containing the appropriate OCSP
response. This content is recognizable via the same "OCSP Content"
identifier.
When certificates are used with IKEv2, the communicating peers need a
mechanism to determine the revocation status of the peer's
certificate. OCSP is one such mechanism. This document applies when
OCSP is desired and security policy prevents one of the IKEv2 peers
from accessing the relevant OCSP responder directly. Firewalls are
often deployed in a manner that prevents such access by IKEv2 peers
outside of an enterprise network.
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