This app must be used only for retrieve your wifi password if you lost it or to verify if your network is secure in case you use factory wifi password.
Some algorithms to generate wifi passwords used by some spanish operators have been made public. If your default wifi password have been generated using one of these algorithms, your network may be unsecured.
Algorithms included in that app works with WPA encrypted networks named JAZZTEL_XXXX / WLAN_XXXX (where XXXX are four alphanumeric digits) and BSSID starting by:
-00:1B:20
-00:1D:20
-00:1F:A4
-00:23:F8
-38:72:C0
-64:68:0C
-F4:3E:61
Also includes algorithm for WiFi / YaCOM / WLANXXXXXX networks.