Re: [802.21] Mutual authentication requirements in SSG
We have a few relative security aspects:
1. Mutual authentication (entity authentication).
2. Key establishment for message protection.
3. Message protections (encryption and integrity protection).
If we want to make sure that MN receives information from a correct
source, then we have to bind 1-2-3 together so that the message is
authenticated by the entity which have authenticated in 1. Entity
authentication does not imply message authentication (integrity
protection). That is, we cannot depend on transport protection,
since the transport layer ID for the service unit may not be the same as
the MIH ID. The transport layer mutual authentication may not mean
MIH mutual authentication. Furthermore, the protection may be applied
hop-by-hop instead of end-to-end. The information receiver may not be
able to get any assurance on where the information comes from.
There are some options if MN can access a PKI which is media independent
and if the protection is applied at MIH protocol, then the information
can be authenticated by digital signatures, verifiable by MN without step
1 and step 2 we listed in the above. In this case, other cautions must be
taken, for example, to prevent re-play attacks.
However, these are just IFs. We need discuss how applicable these IFs
are.
Regards,
Lily
At 04:23 AM 2/5/2008, komarova wrote:
Hi all,
MN to IS authentication may be optional, but IS to MN authentication
should be mandatory in order to provide guarantee that the MN receives
information from a correct source.
Best regards,
Maryna Komarova
Yoshihiro Ohba a écrit :
Hi Perets,
This topic is important for SSG TR.
On Sun, Feb 03, 2008 at 01:54:07AM -0600, Feder, Peretz (Peretz)
wrote:
Michael: We actually were
planning to use IS in 802.16 before the 802.16
full authentication, if now required we may loose the
pre-authentication
network entry flexibility.
This leads to an issue on whether the security feature to be defined
by a new project (if approved) should be mandatory to use or option
to
use. We may need to define it as option to use at least for
IS,
considering the 802.16 usage mentioned above as well as GAS usage in
802.11u. We may need to investigate the same issue for ES and CS
as
well.
Regards,
Yoshihiro Ohba
________________________________
From: Michael G Williams
[
mailto:Michael.G.Williams@NOKIA.COM] Sent: Friday, February 01, 2008
8:15 PM
To: STDS-802-21@LISTSERV.IEEE.ORG
Subject: [802.21] Mutual authentication requirements in SSG
Hi,
In the security study group, we discussed the need for MIHF level
authentication.
There were a few topics in this area:
What do people see as serving as the basis for credentials for the
MIHF?
Is it possible to reuse the network access authentication or MSTP
transport authentication for the MIHF level?
Is mutual authentication always required, or is one way sufficient
for
some applications?
Is the need for authentication different between the four different
services (management, ES, IS, CE)?
Comments? Proposed solutions?
Best Regards, Michael