Below is the listing of supported protocols for the 8320 as of firmware 4.2.2.171
-- WEP (64 or 128-bit)
-- PSK
-- PEAP
-- LEAP
-- EAP-TLS
-- EAP-FAST
-- EAP-TTLS
-- EAP-SIM
I have successfully connected via WEP 64, 128, WPA and LEAP without issue.