User`s manual

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Choosing WPA-PSK, you must enter WPA Pre-Shared Key and
Group Rekey Interval.
WEP
Encryption
It specifies that a network key is used to encrypt the data is sent
over the network. When this checkbox is selected, it enables data
encryption and prompts the Encryption Strength drop-down menu.
Data Encryption (WEP Enabled) and Network Authentication use
the same key.
Encryption
strength
A session’s key strength is proportional to the number of binary
bits comprising the session key file. This means that session keys
with a greater number of bits have a greater degree of security,
and are considerably more difficult to forcibly decode. This drop-
down menu sets either a 64 8-bit (5-character or 10-character
hexadecimal or 128 8-bit (13-character or 10-character) key.
If you set a minimum 128-bit key strength, users attempting to
establish a secure communications channel with your server must
use a browser capable of communicating with a 128-bit session
key.
The Encryption Strength settings do not display unless the network
Authentication (shared Mode) check box is selected.