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This draft is a work item of the Mobility for IP: Performance, Signaling and Handoff Optimization Working Group of the IETF.
Title : Distributing a Symmetric FMIPv6 Handover Key using SEND
Author(s) : J. Kempf, et al.
Filename : draft-ietf-mipshop-handover-key-02.txt
Pages : 12
Date : 2007-9-26
Fast Mobile IPv6 requires that a Fast Binding Update is secured
using a security association shared between an Access Router and a
Mobile Node in order to avoid certain attacks. In this document, a
method for provisioning a shared key from the Access Router to the
Mobile Node is defined to protect this signaling. The Mobile Node
generates a public/private key pair using the same public key
algorithm as for SEND (RFC 3971). The Mobile Node sends the public
key to the Access Router. The Access Router encrypts a shared
handover key using the public key and sends it back to the Mobile
Node. The Mobile Node decrypts the shared handover key using the
matching private key, and the handover key is then available for
generating an authenticator on a Fast Binding Update. The Mobile
Node and Access Router use the Router Solicitation for Proxy
Advertisement and Proxy Router Advertisement from Fast Mobile IPv6
for the key exchange. The key exchange messages are required to
have SEND security; that is, the source address is a CGA and the
messages are signed using the CGA private key of the sending node.
This allows the Access Router, prior to providing the shared
handover key, to verify the authorization of the Mobile Node to
claim the address so that the previous care-of CGA in the Fast
Binding Update can act as the name of the key.
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