Hot answers tagged wpa2-psk
8
Well, it depends on the which protocol is being used.
For WEP and WPA, the keys used are derived directly from the pre-shared keys; that means that as long as you know the pre-shared keys, you can immediately decrypt packets as well.
On the other hand, WPA2 is somewhat stronger; the two sides exchange nonces to derive the keys. Hence, unless you listen ...
7
Curiously, the answer is »Yes« to both questions.
Each client (STA) establishes a different pairwise transient key (PTK) with the access point (AP) for each session, but this PTK is derived from the pairwise master key (PMK). And if you are using a pre-shared key (PSK, usually derived from a password entered by the users), this PSK is used as the PMK.
The ...
2
As Thomas pointed out in his comment, in WPA-PSK the parties already have a shared secret (the pre-shared key), so there is no need to go through the step of Diffie-Hellman key-exchange, which is a way for parties to agree on a shared key when they don't have any secrets in common to begin with.
In WPA, the client and the access point goes through a step ...
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