Acer IEEE 802.11b Wireless USB Adapter - Manual (Page 33)

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3.3.4 Encryption
You may enhance the security level of wireless network by
enabling the Encryption function.
•
WEP Key to use:
You can choose one of the four Keys you typed (Key1~Key4) as
the WEP Key.
•
WEP Mode:
If you set the Mode Optional, your device can communicate with
the stations with disabled WEP. Otherwise, if you set the Mode
Mandatory, then your device cannot communicate with the
stations with disabled WEP.
•
Authentication Type:
Mostly, Open System Authentication algorithm is adopted. In
Shard Key Authentication algorithm, you must have WEP on, the
algorithm should be different, and some steps use packets with
encryption by transferring a challenge text. In order to choose
which authentication algorithm will be used, you must know which
one the AP supports first. Most of the APs only support Open
System.