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I'm trying to decrypt captured wpa-psk traffic with tshark, but it's not recognizing the option I'm trying to override. This option allows me to specify a PSK to use for decrypting. I'm using tshark 1.8.1 from the Backtrack R3.

# tshark -o wlan.wep_key1:wpa-pwd:foo:bar
tshark: -o flag "wlan.wep_key1:wpa-pwd:foo:bar" specifies unknown preference

It appears from other posts that this option has worked before (here and here).

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