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Wireless Configuration 6 - 25
6.1.2.8 WEP 128 and KeyGuard
Wired Equivalent Privacy
(WEP) is a security protocol specified in the IEEE
Wireless Fidelity
(Wi -Fi) standard. WEP is
designed to provide a WLAN with a level of security and privacy comparable to that of a wired LAN.
KeyGuard is a Motorola Solutions encryption option used with legacy clients capable of supporting it. It closely resembled
WEP 128 in key structure.
WEP can be used with open, shared, MAC and 802.1 X EAP authentications. WEP is optimal for WLANs supporting legacy
deployments when also used with 802.1X EAP authentication to provide user and device authentication and dynamic WEP
key derivation and periodic key rotation. 802.1X provides authentication for devices and also reduces the risk of a single
WEP key being deciphered. If 802.1X support is not available on the legacy device, MAC authentication should be enabled
to provide device level authentication.
WEP 128 and KeyGuard use a 104 bit key which is concatenated with a 24-bit
initialization vector
(IV) to form the RC4
traffic key. WEP may be all a small-business user needs for the simple encryption of wireless data. However, networks
that require more security are at risk from a WEP flaw. WEP is only recommended if there are client devices that are
incapable of using higher forms of security. The existing 802.11 standard alone offers administrators no effective method
to update keys.
WEP 128 or Keyguard provide a more robust encryption algorithm than WEP 64 by requiring a longer key length and pass
key. Thus, making it harder to hack through the replication of WEP keys.
To configure WEP 128 encryption on a WLAN:
1. Select
Configuration
>
Wireless
>
Wireless LANs
to display a high-level display of the existing WLANs available
to the wireless controller managed network.
2. Select the
Add
button to create an additional WLAN, or select
Edit
to modify the properties of an existing WLAN.
3. Select
Security
.
4. Select either the
WEP 128
or
Keyguard
radio button from within the Select Encryption field.
The screen populates with the parameters required to define a WEP 128 or KeyGuard configuration for the WLAN.
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