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To understand how an attacker can compromise WEP security, you must know how the binary XOR operation works. An XOR takes two binary numbers of equal lengths and performs a comparison of each bit, yielding a result of bits that is equal to the two numbers. The following list shows the result of XOR operations:

The XOR is frequently used by stream ciphers to encrypt data. For example, the name BEN can be represented in ASCII as 0x42 0x45 0x4E and converted to the binary for transmission or storage. The RC4 algorithm might generate the keystream shown next. You then perform an XOR on the plaintext with the keystream. The result is the ciphertext.

Media Access Control (MAC) address An addressing scheme that uniquely identifies individual physical network adapters on a network whether those adapters are connected to a computer or a network management device. metabase A repository of configuration information for IIS as well as any sites being served from a particular IIS installation.

Plaintext Keystream Ciphertext XOR 01000010 01101100 00101110 01000101 00010111 01010010 01001110 01101111 00100001

If you convert the ciphertext back to ASCII characters, you get the following: - . The problem with using XOR for encryption is that if you know any two of the three elements, you can determine the one you do not know. For example, if you can intercept the plaintext and the ciphertext, you can determine the keystream by performing an XOR on the plaintext with the ciphertext:

Plaintext Ciphertext Keystream XOR 01000010 00101110 01101100 01000101 01010010 00010111 01001110 00100001 01101111

NetBIOS Extended User Interface (NetBEUI) A network protocol created by IBM and supported in Windows XP for routing network traffic. It has been largely supplanted in Windows XP by TCP/IP. NetBIOS The default application programming interface used for networking in earlier versions of Windows. Originally combined with NetBEUI (which is still supported), it can be paired with other networking protocols such as IP and IPX. NetBIOS uses 15-character names to identify individual computers. network adapter A device that enables a computer to be connected to a network; sometimes referred to as a network interface card (NIC).

Whenever you install a new application, it s always a good habit to go to Microsoft Update (http://update.microsoft.com) or Windows Update (http://windowsupdate.microsoft. com) to get all the high-priority updates. Or you can click the Microsoft Update hyperlink on the Setup Complete page of the setup application, as shown in Figure 2-8. I prefer Microsoft Update because you get all the updates you need for all the Microsoft software already installed on your hard disk. You ll get updates for Windows, the Microsoft Office system, SQL Server, Windows Defender, and the .NET Framework along with your hardware drivers updates, all in one stop! It s also important to verify that your antivirus application and its signatures are up-to-date and that you have updated antispyware installed. Finally, in Control Panel, open the Security Center, and make sure all lights for the firewall, virus protection, automatic updates, and all other security settings are green. If not, address those issues to prevent any security hazards. Click the Exit button when you are done. If you elected to send the feedback of your installation to Microsoft on exit, the setup application will send it to Microsoft s servers, as shown in Figure 2-9.