(This is in contrast to the single WPA-Personal
passphrase or WEP encryption key that everyone on the network shares.)
The real problem is that, like the hidden SSID dilemma explained earlier in
this chapter in ???Sniff Out WiFi Hotspots,??? a savvy intruder can use monitoring
software to grab MAC addresses out of the air and use them to connect.
Think it??™s difficult to change the MAC address? Think again. You can use
Mac Makeup, available for free from http://www.gorlani.com/publicprj/
macmakeup/macmakeup.asp, or MadMACs, free from http://www.irongeek.
com/i.php?page=security/madmacs-mac-spoofer, to change your wireless
adapter??™s MAC address in a few moments.
You can also change your MAC address??”without any special software??”by
editing the Registry. Open Registry Editor (Chapter 3) and expand the
branches to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\
{4D36E972-E325-11CE-BFC1-08002BE10318}. Press Ctrl-F, type DriverDesc in
the box, and click Find Next. Press F3 to cycle through the subkeys here (e.g.,
0001, 0002, etc.) until you hit the one where the DriverDesc value matches the
name of your wireless adapter. Once you stumble upon the correct key, select
Edit ??? New ??? String Value, and name the value NetworkAddress. Doubleclick
the new value, type the MAC address you want to use in the Value data
field (without any hyphens, like this: 040815162342), and click OK. To put the
new address into effect, use the Network Connections window to disable and
then re-enable your network adapter (or restart Windows).
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