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-00.txt
Pages : 17
Date : 2005-5-16
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 but which requires the public keys
of multiple nodes 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.
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