WG Action: RECHARTER: Handover Keying (hokey)

IESG Secretary <iesg-secretary@ietf.org> Tue, 24 November 2009 22:32 UTC

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Subject: WG Action: RECHARTER: Handover Keying (hokey)
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The charter of the Handover Keying (hokey) working group in the Security
Area of the IETF has been updated.  For additional information, please
contact the Area Directors or the working group Chairs.

Handover Keying (hokey)
Last Modified: 2009-10-19


Glen Zorn <gwz@net-zen.net> 
Tina Tsou (Ting ZOU) <tena@huawei.com> 

Security Area Director(s):

Tim Polk <tim.polk@nist.gov> 
Pasi Eronen <pasi.eronen@nokia.com> 

Security Area Advisor:

Tim Polk <tim.polk@nist.gov> 

Mailing Lists:

General Discussion: hokey@ietf.org
To Subscribe: https://www.ietf.org/mailman/listinfo/hokey
Archive: http://www.ietf.org/mail-archive/web/hokey/current/maillist.html

Description of Working Group:

A mobile device has to re-authenticate each time it changes its point of
attachment to the network. When it goes through the full procedure of
authentication it creates a series of ruptures, during which the medium
cannot flow. This results in a poor user experience during handover.
However, it is possible to shorten the time it takes to re-authenticate by
reusing the key information developed during the initial authentication.

The Handover Keying Working Group is concerned with developing procedures
for key reuse and delivery, while respecting good security practice. The
Handover Keying Working Group has already done work on this subject, but
it has not yet developed the complete set of procedures, protocols, and
changes needed for different security environment scenarios and

The solutions specified by the HOKEY WG fall into several categories,
based on timing and mechanism. The authentication and key management may
occur before handoff, when latency is much less critical. Alternatively,
authentication and key management can occur as part of the handoff, where
latency is critical. Solutions should reduce or eliminate the number of
referrals to AAA servers, and solutions should avoid re-executing lengthy
EAP method exchanges. This may be accomplished by providing new mechanisms
for cryptographic keying material in combination with a protocol for the
timely delivery of appropriate keys to the appropriate entities. Solutions
are expected to include "handover keying," "low-latency
re-authentication," and "pre-authentication" or "early authentication".

All solution categories are useful, each supporting different scenarios.
The HOKEY WG may provide multiple solutions, each addressing a different

Solutions specified by the HOKEY WG must:

1) Be responsive to handover and re-authentication latency performance
objectives within a mobile wireless access network.

2) Fulfill the requirements in RFC 4962 and RFC 5247.

3) Be independent of the access-technology. Any key hierarchy topology or
protocol defined must be independent of EAP lower layers. The protocols
may require additional support from the EAP lower layers that use it.

4) Accommodate inter-technology heterogeneous handover and roaming.

5) Not require changes to EAP methods. Any extensions defined to EAP must
not cause changes to existing EAP methods.

In specifying an access-technology-independent solution, media
guidelines for SDOs may also be needed to explain how the keying material
and signaling can be employed in a specific access technology.

HOKEY WG Deliverables

1) A specification of Local Domain Name Discovery for ERP. Currently the
use of DHCP mechanisms to request the local domain name is unspecified.
There are other useful scenarios that need to be addressed. Lower layer
announcement for local domain name is unspecified. Ambiguity with using
initial full EAP exchange for re-authentication needs to be clarified.
Additional re-authentication scenarios, for which there is interest, need
to be addressed.

2) A specification of Early Authentication solutions. These include use
EAP to pre-establish authenticated keying material on a target
authenticator prior to arrival of the peer.

3) A specification for a Hokey architecture Document. It includes
deployment of ERP and EAP early authentication protocol in the mobile
environment. There are various useful scenarios that need to be addressed.
This specification and the revision of RFC5296 should be conducted in

4) Assistance to the 802.21a group in specifying the integration of EAP
pre-authentication with IEEE 802.21a. The Hokey Working Group shall
perform tasks that are complementary to and do not duplicate work being
done in IEEE 802.21a.

6) A specification for NAS-Authenticator interaction. NAS interaction can
be used to release resources in the old NAS and achieve faster initiation
of authentication. Related work in external SDOs on authenticator/NAS
interaction for re-authentication may be taken into consideration.

7) A revision of RFC 5296 to eliminate unnecessary references to the home

8) Assistance to the radext and dime Working Groups in developing AAA
support for handoff keying.

Goals and Milestones:
Nov 2009 First draft on Local Domain Name Discovery for ERP
Nov 2009 First draft on Early Authentication solutions
Mar 2010 First draft on Hokey architecture
Mar 2010 First draft on NAS-Authenticator Interaction
Jul 2010 First draft on revision of RFC 5296
Mar 2011 Submit the Local Domain Name Discovery for ERP draft to IESG
Mar 2011 Submit the Early Authentication solutions draft to IESG
Jul 2011 Submit the NAS-Authenticator Interaction draft to IESG
Nov 2011 Submit the Hokey architecture draft to IESG
Nov 2011 Submit the revision of RFC 5296 to IESG
Mar 2012 Re-charter or shut down WG