Uninstall An Old Driver; Additional Security Features; Message Integrity Check (Mic) - Atheros AR5B225 User Manual

Uninstall an Old Driver

Uninstall an old driver before upgrading to a new NDIS driver release.
To remove the newly installed driver from the system if the system does not have
previously installed versions of the NDIS driver, proceed to Step 4.
1. To remove the NDIS driver from the OS, go to Device Manager, right-click
AR500x Wireless Network
2. Click OK
3. When the device is uninstalled from Device Manager, search for and delete the
driver files that reside in the system.
a. Go to the Start menu and choose Search > For Files or Folders.
b. Enter oem*.inf in the Search for files or folders named: field, and enter
Atheros in the
c. Click
drivers have not been removed properly.
d. Choose the files that have been found and delete them from the system.
4. To complete the uninstallation, remove the file ar5211.sys from the folder
\WINNT\system32\drivers.

Additional Security Features

These security features prevent attacks on a wireless network's WEP keys. The wireless
adapter automatically supports each of these features, but these features must be enabled
on the access point.

Message Integrity Check (MIC)

MIC prevents bit-flip attacks on encrypted packets. In a bit-flip attack, someone
intercepts an encrypted message retransmits it after some alterations. Thus the receiver
accepts the message as legitimate. The MIC adds some bytes to each packet to protect it
against tampering.
Temporal Key Integrity Protocol (TKIP)
This feature prevents attacks on WEP in which someone catches encrypted packets and
uses their initialization vector (IV) to decipher the WEP key. TKIP removes the
predictability to protect both unicast and broadcast WEP keys.
Broadcast
Key Rotation
EAP authentication provides dynamic unicast WEP keys for wireless adapters, but uses
static broadcast keys. In broadcast WEP key rotation, the access point supplies a
dynamic broadcast WEP key and changes it at intervals.
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Adapter, and choose Uninstall.
to uninstall the device.
Containing text:
Search Now. A few files matching these criteria are possible, if previous
field.
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• xxvii
January 2011