questions about WPA-PSK and EAP-PSK

SHI YU-SONG-W20040 W20040
Fri Jan 28 02:08:38 PST 2005

  Thanks your quick help.
  How to send EAPOL-Key messages if we do not config IEEE802.1x?  I think EAPOL-Key is a part of IEEE802.1x. 

  I know the pre-shared key is the PMK, In WPA-PSK mode, need not 802.1x authentication with server, but still need 802.1x to transfer EAPOL-Key messages. and we still need to build eapol_sm.c and eap.c files, right? 
  EAP-PSK is a method of open source wpa_supplicant. I also confused it.  

-----Original Message-----
From: Manoj Verma, Noida [mailto:manojv at]
Sent: 2005?1?28? 17:49
To: SHI YU-SONG-W20040; hostap at
Subject: RE: questions about WPA-PSK and EAP-PSK

See comments below..

>-----Original Message-----
>From: at [mailto:hostap-
> at] On Behalf Of SHI YU-SONG-W20040
>Sent: Friday, January 28, 2005 3:10 PM
>To: hostap at
>Subject: questions about WPA-PSK and EAP-PSK
>   Would anyone please help to clarify the following issues, any help is
>very appreciated.
>    Does the WPA-PSK mode also need to config IEEE802.1x? because WPA-PSK
>also support WPA 4-Way Handshake to generating encrytion data key, by
>exchanging EAPOL-Key messages between supplicant and authenticator, right?

There are two types of Infrastructure BSS:
1. Enterprise mode: This is the place where 802.1x authentication is used.
Through 802.1x only the PMK is obtained which are used for derivation of
(PTK) - EPAOL and temporal keys. After this 4-way and Group h/s starts.

2. Personal mode: Here 802.1x is not used. Rather the Passphrase which we
set at the AP and Supplicant side, is used for the derivation of EPAOL and
temporal keys. After this 4-way and Group h/s starts which are nothing but
part of EAPOL protocol.

>    What's the difference between WPA-PSK and EAP-PSK? If I only try to
>WPA-PSK, Does I need to config EAP-PSK to include IEEE802.1x? (But in the
>README, which said that WPA-PSK mode does not require EAPOL/EAP
>implementation, I think need EAPOL-Key to support WPA 4-Way Handshake).

I think the above should answer this. 
(Also I haven't heard of EAP-PSK).

>Best Regards
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