Hi Lakshminath,
Lakshminath Dondeti schrieb:
At the expense of generating some confusion, here is my take on this:
The objection is to having to carry multiple integrity checksums in
GPSK, if we used the combined mode *and* an integrity algorithm.
I don't agree with you. There is no reason to optimize a few bits in a
pre-shared secret method.
Note that we are not talking about a protocol for data transfer.
We wanted the flexibility to use different cipher suites. We do not only
want to use cipher suites that provide authenticated encryption (since
we almost have nothing to encrypt; currently 1 bit and almost no EAP
method provides this functionality).
Ciao
Hannes
I think CCM is fine for instance, the only catch is that we need to make
sure and define AAD for CCM carefully to include appropriate data into
the integrity checksum calculation. So, once we define CCM as the mode,
we shouldn't need AES-CMAC-128 if encryption is being used.
I would suggest using CCM and specifying the use of it fully so it can
be used without misunderstandings. If you want me to put some time into
writing that up, let me know.
cheers,
Lakshminath
At 10:55 PM 8/20/2006, Hannes Tschofenig wrote:
Hi all,
the current version of the document
http://tools.ietf.org/wg/emu/draft-clancy-emu-eap-shared-secret-01.txt
still supports AES-EAX:
+-----------+----+-------------+---------------+--------------------+
| CSuite/ | KS | Encryption | Integrity | Key Derivation |
| Specifier | | | | Function |
+-----------+----+-------------+---------------+--------------------+
| 0x000001 | 16 | AES-EAX-128 | AES-CMAC-128 | GKDF-128 |
+-----------+----+-------------+---------------+--------------------+
At the IETF#66 EMU meeting AES CCM was suggested.
Later, it got the impression that AES-CBC was more appreciated. Should
we update the draft with AES-CBC?
Ciao
Hannes
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