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Capture encrypt 802.11 and decrypt later?

I want to use an external wifi adapter (with a higher range than my internal), wich i can't use to connect directly to my network. However i just captured in monitor mode with tshark, then loaded it in wireshark... but i wasn't able to encryt the data (i set my network data as "passphrase:ssid")... Can someone help me out? Or do i have to be connected to get the same data?