[Pana] Regarding the optimization scope in EAP-PSK with PANA

Raja ashok <raja.ashok@huawei.com> Thu, 01 December 2016 10:07 UTC

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From: Raja ashok <raja.ashok@huawei.com>
To: "yoshihiro.ohba@toshiba.co.jp" <yoshihiro.ohba@toshiba.co.jp>, "basavaraj.patil@nokia.com" <basavaraj.patil@nokia.com>, "alper.yegin@yegin.org" <alper.yegin@yegin.org>, "jari.arkko@piuha.net" <jari.arkko@piuha.net>, "Pana@ietf.org" <Pana@ietf.org>
Thread-Topic: Regarding the optimization scope in EAP-PSK with PANA
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Date: Thu, 1 Dec 2016 10:06:15 +0000
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Subject: [Pana] Regarding the optimization scope in EAP-PSK with PANA
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Hi All,

Currently EAP-PSK with PANA takes 5RTT. I am felling this should be optimized for wiresless sensor network in mesh topology.

EAP-PSK 3rd and 4th message contains Protected channel (PCHANNEL). This is a secure channel formed between client and server with EAX algorithm. But as per my knowledge this channel is not required if EAP-PSK is used with PANA. Because anyway PANA session keys are there with that we can exchange information securely using Encrypt-Encapsulate AVP and Auth AVP.

So if we define a simplified EAP-PSK mechanism without PCHANNEL, we can omit 1 RTT message. This has been explained below

Client                                                                                                                    Server
-------                                                                                                                    --------
PAR/EAP-PSK 1st msg
[Flags||RAND_S||ID_S]                               --->
                                                                                                                PAN/EAP-PSK 2nd msg
                                                                                <---                        [Flags||RAND_S||RAND_P||MAC_P||ID_P]
                PAR’C’/EAP-PSK 3rd msg
[Flags||RAND_S||MAC_S]                         --->

Here we can omit EAP-Success msg also in PAR’C’ msg, because PANA result code AVP is there. I hope that is sufficient. So we can send EAP-PSK 3rd msg in PAR ‘C’ msg directly.

This saves 1 RTT in handshake. And also the EAX algorithm is not required, so this saves some flash memory in constraint environment. But this simplified EAP-PSK cannot be used alone. This can be used only with PANA.

Please provide your comments on it.



Raja Ashok V K
Huawei Technologies
Bangalore, India
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