I-D ACTION:draft-kempf-mobopts-ringsig-ndproxy-02.txt

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A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: Secure IPv6 Address Proxying using Multi-Key
                          Cryptographically Generated Addresses (MCGAs)
	Author(s)	: J. Kempf, C. Gentry
	Filename	: draft-kempf-mobopts-ringsig-ndproxy-02.txt
	Pages		: 17
	Date		: 2005-8-23
	
RFC 3971 and 3972 (SEND) define a protocol for securing resolution of 
a statelessly autoconfigured IPv6 address to a link address as 
defined by IPv6 Neighbor Discovery. SEND does this by requiring the 
autoconfigured addresses to be cryptographically generated by the 
host from an RSA public key. However, one drawback of SEND is that 
such addresses cannot be securely proxied. Proxy Neighbor Discovery 
is important for Mobile IPv6 and in certain other cases. In this 
document, we describe an extension of SEND to addresses that are 
cryptographically generated using multiple public keys, called multi-
key CGAs. Neighbor Discovery messages for multi-key CGAs are signed 
with an RSA ring signature, a type of signature that can be generated 
using the private key of any node from a group of nodes but which 
requires the public keys of all group members to verify. Multi-key 
CGAs can be securely proxied by all nodes that contribute keys to the 
address. The advantage of multi-key CGAs over other techniques of 
secure address proxying, such as trusting the router or using an 
attribute certificate, is that it preserves location privacy. A 
receiver cannot determine from the IPv6 address, ring signature, or 
cryptographic parameters whether the node or the proxy is defending 
the address, and hence whether the node is on or off the link.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-kempf-mobopts-ringsig-ndproxy-02.txt

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