Asus USB-N10 - Manual (Page 31)

ASUS USB-N10 Chapter 4: Using the ASUS WLAN Control Center 31
For 128-bit encryption, you are required to enter four WEP Keys. Each Key
contains exactly 26 hex digits (0~9, a~f, and A~F).
Select one as your Default Key
The Default Key field allows you specify which of the four encryption keys is to
use for transmitting data over wireless LAN. You can change the default key by
clicking on the downward arrow, selecting the number of the key you want to use,
and clicking the “Apply” button. If the access point or station with which you are
communicating uses the identical key by the same sequence, you can use any of
the keys as the default on your network adapter.
Click Apply after you have created the encryption keys, the Wireless Settings
Utility uses asterisks to mask your keys.
64/128bits versus 40/104bits
There are two levels of WEP Encryption: 64 bits and 128 bits.
Firstly, 64 bit WEP and 40 bit WEP are the same encryption method and
can interoperate in the wireless network. This lower level of WEP encryption
uses a 40 bit (10 Hex character) as a “secret key” (set by user), and a 24 bit
“Initialization Vector” (not under user control). This together makes 64 bits (40 +
24). Some vendors refer to this level of WEP as 40 bits and others refer to this
as 64 bits. Our Wireless LAN products use the term 64 bits when referring to this
lower level of encryption.
Secondly, 104 bit WEP and 128 bit WEP are the same encryption method and
can interoperate in the wireless network. This higher level of WEP encryption
uses a 104 bit (26 Hex character) as a “secret key” (set by user), and a 24 bit
“Initialization Vector” (not under user control). This together makes 128 bits (104 +
24). Some vendors refer to this level of WEP as 104 bits and others refer to this as
128 bits. Our Wireless LAN products use the term 128 bits when referring to this
higher level of encryption.