Difference between WPA1-PSK CCMP and WPA2-PSK CCMP
palam at pacbell.net
Tue Aug 29 01:39:14 EDT 2006
On Aug 28, 2006, at 9:47 AM, Bryan Kadzban wrote:
> On Tue, Aug 29, 2006 at 01:13:48AM +1000, Nicholas Chan wrote:
>> Hi i noticed in wpa_supplicant, you have a choice between wpa1-psk
>> ccmp and wpa2-psk ccmp.
>> I was wonder what is the difference between them? From the 802.11i
>> standard, it states that wpa1-psk uses TKIP whereas wpa2-psk uses
> Both WPA1 and WPA2 can use either TKIP or CCMP encryption. (It is
> that some APs and some clients restrict the combinations, but there
> four possible combinations, and AFAIK all of them are Wi-Fi Alliance
> standards. WPA1 with CCMP may not be, but I believe it is.)
> The difference between WPA1 and WPA2 is in the information elements
> get put into the beacons, association frames, and 4-way handshake
> frames. The data in these IEs is basically the same, but the
> used is different. WPA1 uses (one of?) Microsoft's OUI(s) along
> with an
> ID byte or two that Microsoft guarantees is unique as its IE
> while WPA2 uses an IE identifier that the IEEE assigned as part of the
> 802.11i standard.
The 4-way handshake for WPA2 is also slightly different than WPA in
the way the 3rd and 4th PDUs are encrypted.
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