I-D ACTION:draft-ietf-mipshop-handover-key-03.txt

A New Internet-Draft is available from the on-line Internet-Drafts 
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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-03.txt
	Pages		: 12
	Date		: 2007-10-31

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 
     Cryptographically Generated Address 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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