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How to Decrypt 802.11
Wireshark can decrypt WEP and WPA/WPA2 in pre-shared (or personal) mode. WPA/WPA2 enterprise mode decryption is not yet supported.
You can add decryption keys usingWireshark's 802.11 preferences or by using the wireless toolbar. Up to 64 keys are supported.
Adding Keys: 802.11 Preferences
Go to Edit->Preferences->IEEE 802.11. You should see a window that lookslike this:

Note that the key examples mention WPA, and that each key item is labeled "Key". If your preferences window doesn't mention WPA, like this

then your version of Wireshark only supportsWEP decryption. This might be the case with older versions of Wireshark, particularly the 64-bit Windows version.
In all versions WEP keys can be specified as a string of hexadecimal numbers, with orwithout colons:
-------------------------------------------------
a1:b2:c3:d4:e5
-------------------------------------------------
0102030405060708090a0b0c0dIn versions that support WPA decryption you should use a prefix to tell Wireshark what kind of key you're using:
* wep The key is parsed as a WEP key.-------------------------------------------------
wep:a1:b2:c3:d4:e5
* wpa-pwd The password and SSID are used to create a raw pre-shared key.
-------------------------------------------------wpa-pwd:MyPassword:MySSID
* wpa-psk The key is parsed as a raw pre-shared key.
-------------------------------------------------
wpa-psk:0102030405060708091011...6061626364Adding Keys: Wireless Toolbar
If you are using the Windows version of Wireshark and you have an AirPcap adapter you can add decryption keys using the wireless toolbar. If the toolbar isn't visible, youcan show it by selecting View->Wireless Toolbar. Click on the Decryption Keys... button on the toolbar:

This will open the decryption key managment window. As shown in the window you can...