A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Link Layer Hashed Based Addresses (LL-HBA) for Secure Neighbor Discovery (SEND)
Author(s) : J. Laganier, G. Montenegro
Filename : draft-laganier-send-ll-hba-00.txt
Pages : 18
Date : 2005-9-14
The current mechanisms used by Secure Neighbor Discovery (SEND) to
secure the Neighbor Discovery Protocol (NDP) relies almost solely on
public key cryptography (i.e. Certificates and/or Cryptographically
Generated Addresses). While these approaches provide very strong
guarantees on the authenticity of an IP address to link layer address
mapping, they are computationally expensive, which might be a problem
on resource-constrained devices.
It is also recognized in the SEND specification that it does not
compensate for an insecure link layer; more specifically, no
protections are offered against spoofing, link disruption, or bombing
DoS attacks launched at the link layer. Accordingly, this note
suggests an alternative to the current specification of SEND which
leverage on the deemed required link layer security to secure NDP.
This technique is based on the use of a specific kind of IPv6
addresses, the so-called Link Layer Hashed Based Addresses (LL-HBA),
and of link layer address reachability tests.
When the link layer security prevents attacker to redirect frames at
the link layer layer, this technique allows to provide some level of
security to NDP while relying solely on symmetric (i.e.,
computationally inexpensive) cryptography.
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