Alvarion BreezeACCESS VL 5.4 System Manual page 120

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Security Parameters
Unauthorized wireless connection is prevented using the Wired Equivalent
Privacy (WEP) algorithm defined in the IEEE 802.11 Wireless LAN
standard. The WEP is based on the RSA's RC4 encryption algorithm.
The following parameters are available through the Security Parameters
menu:
Authentication Algorithm
The Authentication Algorithm option determines the operation mode of the
selected unit. The two options are Open System and Shared Key:
Open System
An SU configured to Open System can only associate with an AU also
configured to Open System. In this case, the WEP algorithm is not used.
Shared Key
In this mode the authentication messages are encrypted. An SU configured
to use a Shared Key can only be authenticated by an AU configured to use
a Shared Key, provided the applicable WEP Key (which means both the
key number and its content) in the AU is identical to the key selected as
the Default Key in the SU.
The default is Open System.
NOTE:
The Shared Key option cannot be selected before at least one WEP Key is defined. In the
SU, a Default Key ID that refers to a valid WEP Key must be selected.
Default Key ID (SU only)
The Default Key ID defines the ID of the key to be used for
encrypting/decrypting the authentication messages.
Available values range from 1 to 4.
The default is WEP KEY # 1.
WEP KEY 1 through WEP KEY # 4
These options enable entering the encryption key to be used for initializing
the pseudo-random number generator. Subscriber Units must use the
same WEP Key as the Access Unit.
The WEP Key is a string of 10 hexadecimal numbers.
The default for all 4 keys is a string of 10 zeros, which means no key.
BreezeACCESS VL System Manual