To decrypt 802.11 header in Wireshark, you must know the WPA password.
Now, for example, there is a network which when clicked takes you to a login page where every user on the network has a username and a password. So, it's an open network but redirects you to a page with a login screen.
If I decrypt the 802.11 packets with wireshark with my username and password, can I see all the other packets, like other people that are browsing without knowing their username and password? Like, instead of seeing "protocol:802.11", can I see "http,tcp"? Even though it's all on the same network but everyone has their own password? If, what i am saying is wrong, is there a way to decrypt 802.11 headers without knowing the WPA password?
I am not sure how much sense it made but if some part does'nt make sense, please ask.