Wireless: Cisco Aironet 1040 single band 802.11n (Basic configuration)

Create a SSID

ap.(config)#dot11 ssid testap2
ap.(config-ssid)#

Enable SSID broadcast

ap.(config-ssid)#guest-mode

Setting up WPA-PSK

ap.(config-ssid)#authentication open

ap.(config-ssid)#authentication key-management wpa

ap.(config-ssid)#wpa-psk ascii cisco123

Attached radio interface to ssid

ap.(config)#int dot11Radio 0
ap.(config-if)#ssid testap2

ap.(config-if)#encryption mode ciphers aes-ccm

(Default cipher is aes-ccm so you have the option not to explicitly configure the cipher)