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
PAR/EAP-PSK 1st msg
PAN/EAP-PSK 2nd msg
PAR’C’/EAP-PSK 3rd msg
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
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