Hi Ashok,
According to RFC 3748: “the authentication conversation can continue until the
authenticator determines that successful authentication has occurred, in which
case the authenticator MUST transmit an EAP Success (Code 3).”
Without changing RFC 3748, I do not think we can design an EAP method that does
not use EAP Success.
Regards,
Yoshihiro Ohba
From: Raja ashok [mailto:raja.as...@huawei.com]
Sent: Thursday, December 01, 2016 6:06 PM
To: ohba yoshihiro(大�� �x洋 ＴＥＡ Advanced Technical Marketing Department);
basavaraj.pa...@nokia.com; alper.ye...@yegin.org; jari.ar...@piuha.net;
Pana@ietf.org
Subject: Regarding the optimization scope in EAP-PSK with PANA
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.
Regards,
Ashok
[Company_logo]
Raja Ashok V K
Huawei Technologies
Bangalore, India
http://www.huawei.com
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