Additional Wep Key Security Features - Cisco AIR-PCI340 Installation And Configuration Manual

Setting Network Security Parameters
Note This feature does not need to be enabled on the client adapter or access point; it is supported
automatically in the firmware of both devices. However, both the client and access point must use these
firmware versions or greater.

Additional WEP Key Security Features

The three security features discussed in this section (MIC, TKIP, and broadcast key rotation) are
designed to prevent sophisticated attacks on your wireless network's WEP keys. These features do not
need to be enabled on the client adapter; they are supported automatically in the firmware and driver
versions included in the Install Wizard file. However, they must be enabled on the access point.
Access point firmware version 11.10T or greater is required to enable these security features. Refer to
Note
the documentation for your access point for instructions on enabling these security features.
Message Integrity Check (MIC)
MIC prevents bit-flip attacks on encrypted packets. During a bit-flip attack, an intruder intercepts an
encrypted message, alters it slightly, and retransmits it, and the receiver accepts the retransmitted
message as legitimate. The MIC adds a few bytes to each packet to make the packets tamper-proof.
The Status screen indicates if MIC is being used, and the Statistics screen provides MIC statistics.
If you enable MIC on the access point, your client adapter's driver must support these features;
Note
otherwise, the client cannot associate.
Temporal Key Integrity Protocol (TKIP)
This feature, also referred to as WEP key hashing, defends against an attack on WEP in which the
intruder uses the initialization vector (IV) in encrypted packets to calculate the WEP key. TKIP removes
the predictability that an intruder relies on to determine the WEP key by exploiting IVs. It protects both
unicast and broadcast WEP keys.
If you enable TKIP on the access point, your client adapter's firmware must support these features;
Note
otherwise, the client cannot associate.
TKIP is automatically enabled whenever WPA is enabled, and it is disabled whenever WPA is disabled.
Note
Broadcast Key Rotation
EAP authentication provides dynamic unicast WEP keys for client devices but uses static broadcast, or
multicast, keys. When you enable broadcast WEP key rotation, the access point provides a dynamic
broadcast WEP key and changes it at the interval you select. When you enable this feature, only wireless
client devices using LEAP, EAP-TLS, PEAP, or EAP-SIM authentication can associate to the access
point. Client devices using static WEP (with open or shared key authentication) cannot associate.
Cisco Aironet 340, 350, and CB20A Wireless LAN Client Adapters Installation and Configuration Guide for Windows
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Chapter 5 Configuring the Client Adapter
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