1. 21-07-0122-03-00001 IEEE 802.21 MEDIA INDEPENDENT HANDOVER Title: An Architecture for Security Optimization During Handovers Date Submitted: September, 2007 Presented at IEEE 802.21 session #22, Hawaii Authors or Source(s): Subir Das (Telcordia), Yoshihiro Ohba (Toshiba) Abstract: This document describes an 802.21-based architecture for security optimization during handovers

2. 21-07-0122-03-00002 IEEE 802.21 presentation release statements This 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 outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> Section 6.3 of the IEEE-SA Standards Board Operations Manualhttp://standards.ieee.org/guides/opman/sect6.html#6.3 http://standards.ieee.org/board/pat/guide.html

3. 21-07-0122-03-00003 Architectural Alternatives and Recommendation Key hierarchy based transition for intra-domain and intra-technology handover assumes distributed authenticator model Each SDO (e.g., 802.11, WiMAX) is defining its own distributed authenticator model Therefore, it would be difficult to define a unified distributed authenticator model across multiple technologies Key hierarchy based transition for inter-domain and inter-technology handover as defined by IETF HOKEY WG can work with both integrated and distributed authenticator models On the other hand, can we always assume that the key hierarchy is available across multi-provider’s domain? It seems to have some deployment issues since it requires a lot more tightly coupled security policies in place and also needs changes to existing AAA infrastructure Authentication based transition (pre-authentication) can work with both integrated and distributed authenticator models Recommendation to 802.21 Security Study Group: Focus on authentication based transition for the time being In parallel, SG can evaluate the applicability of key hierarchy based transition as defined in IETF HOKEY WG

4. 21-07-0122-03-00004 Functional Elements of Authentication Based Transition MN (Mobile Node) In addition to the functionalities defined in 802.21 specification, MN has the following functionality: EAP Peer PoA (Point of Attachment) In addition to the functionalities defined in 802.21 specification, PoA has the following functionality: EAP Authenticator Pre-authentication Forwarding for indirect pre-authentication PoA acts as MIH PoS On the other hand, SG should also consider the cases where EAP based authentication is not used

5. 21-07-0122-03-00005 Functional Element Mapping to the 802.21 Communication Model Serving PoA R3 MIH MN R1 R2 R4 MIH PoS Non-PoA Network Entity MIH PoS Non-PoS MIH R4 R5 Candidate PoA Non-PoA Network Entity Only R1, R2 and R5 are involved in authentication based transition

6. 21-07-0122-03-00006 Pre-authentication Signaling Flows Serving PoA MIH MN R1 MIH PoS MIH PoS R5 Candidate PoA Home AAA Server MN-CA Signaling (via serving network) EAP over higher layers (HL) EAP over AAA Serving PoA MIH MN R1 R2 MIH PoS MIH PoS R5 Candidate PoA Home AAA Server MN-SA Signaling EAP over L2/HL EAP over AAA SA-CA Signaling EAP over HL Direct Pre-authentication Indirect Pre-authentication R2

7. 21-07-0122-03-00007 Issues Need to be addressed Which EAP over higher layer protocol can we use? IETF defined L3 protocol or 802.21 MIH protocol ? Do we need to support both direct and indirect pre- authentication? Authenticator discovery and context binding issues?