AVM FRITZ!WLAN USB Stick Installation, Configuration And Operation page 28

Encryption
28 FRITZ!WLAN USB Stick – 3 The FRITZ!WLAN Control Software
If you use a WEP key, make sure that it is the correct
length.
WEP ASCII Characters
64 5
128 13
The WPA mechanism provides for authentication while
the connection is being established. The user data are
encrypted using an automatically generated key. This
key is regenerated at regular intervals.
If the WPA security mechanisms are supported by your
WLAN remote sites, use WPA for your WLAN encryption.
Hex. Characters
10
26