According to the Cisco Feature Navigator. 12.4(11)T2 Supports WPA encryption. As for SDM I am uncertain which version supports what features, 2.5 release notes speak of enhanced Wireless funtions but do not specify if this includes WPA. On the other hand I found documents from 2005 where they speak of WPA through SDM(http://www.cisco.com/en/US/docs/routers/access/cisco_router_and_security_device_manager/application/notes/SDM-WLAN.pdf) although they do not specify which version it is, it is far before 2.5 which dates from 2008.