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IEEE 802.21 MEDIA INDEPENDENT HANDOVER
DCN: 21-11-0198-00-srho
Title: Merging Plan for Pull Key Distribution
Date Submitted:
Presented at IEEE 802.21
Authors or Source(s):
Yoshihiro Ohba, Rafa Marin Lopez, Fernando Bernal, Antonio de la Oliva,
Abstract: Merging plan for proactive pull key distribution mechanism into IEEE 802.21c
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IEEE 802.21 presentation release statementsThis document has been prepared to assist the IEEE 802.21 Working Group. It is offered as a basis
for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21.
The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/faq.pdf>
Motivation
• In November 2011 Plenary, the group agreed on supporting proactive pull key distribution for 802.21c (DCN 0186-00)
• Referred to as PPKD
• There was a question about relationship between the proactive pull key distribution scheme and the optimization scheme described in Section 9.7 “Securing Single-Radio messages using SFF” of the working 802.21c draft (DCN 0188-00)
• Referred to as SFF
• We compare PPKD and SFF to see if the two schemes can be merged
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PPKD Scheme (1/2) Identity bootstrap (from TPoS) and MNMSRK installation into the TPoS (AAA)
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PPKD Scheme (2/2)MN to tPoA authentication
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based on MNnetworkAccessId
SFF Scheme
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RAN = BS (WiMAX), AN/PCF (eHRPD)Local Anchor = ASN GW (WiMAX), PDSN (eHRPD)
Originating Network
Home Network
Target Network
OSFF
InternetLocal Anchor
Local Anchor
HSFF
TSFF
RAN
RAN
Local Anchor RAN
MN
K_hsff key between MN and HSFFK_osff key between MN and OSFFK_tsff key between MN and TSFFK_hosff key between HSFF and OSFFK_htsff key between HSFF and TSFFK_otsff key between OSFF and TSFFKDF_hosff key distribution function between HSFF and OSFFKDF_otsff key distribution function between OSFF and TSFF
Common Functionality
• A key (K) to establish a security association between the MN and C-GW is transferred from an anchor node in the source network to the C-GW
• The key is used for the C-GW to authenticate the MN during pre-registration without interacting with the MN’s home network
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Differences between PPKD and SFF• The name of the anchor node in the source network
• In PPKD: sPoS (serving PoS)• In SFF: OSFF (Originating SFF)
• Identifier of MN used by C-GW• In PPKD: MNnetworkacccesId • In SFF: MNaddr
• Name of K and method to generate K• In PPKD: MIRK derived from a key derivation key shared between MN
and sPoS• In SFF: K_tsff generated by OSFF and distributed to MN and TSFF
• Message and target node(s) to distribute K• In PPKD: message: MIH_N2N_LL_Auth, target node: C-GW• In SFF: message: undefined, target nodes: MN and C-GW
• Key or SA to protect message used for distributing K• In PPKD: MIH_SA between sPoS and tPoS• In SFF: K_otsff and K_osff
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Conclusions
• PPKD and SFF are functionally equivalent and therefore can be merged into a single solution
• Considering consistency with 802.21a, use PPKD conventions as much as possible
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