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When the Setup Complete page appears (see Figure 2-8), you are now finished with the installation. That wasn t too painful, was it Before you click the Exit button, please read the following notes.

The 80211 standard supports two subtypes of network authentication service: open system and shared key When open system authentication is used, any computer or device can request authentication for the access point, and consequently, any computer or device can connect to the network Using open system authentication does not prevent data transmission encryption Unlike open system authentication, shared key authentication requires that the client computer or device have knowledge of a secret key that is shared by the wireless access point and all other wireless clients When using shared key authentication, the access point generates a random 64-bit or 128-bit number that is used as a challenge The wireless client returns the challenge, which is encrypted with the WEP shared key The encryption process involves using the RC4 stream cipher to perform an exclusive or (XOR) binary operation on the plaintext payload.

latency The time required for data to travel from one point to another on a network. Layer Two Tunneling Protocol (L2TP) A standard for establishing virtual private network (VPN) communications across the Internet. See also Internet Protocol Security. local area network (LAN) A network situated in one geographical location, often in one building. A LAN can be a workgroup consisting of only a few computers, or it can be a large domain consisting of thousands of computers. See also wide area network.

The RC4 keystream is generated by using a random number generator (RNG) The seed of the RNG is the result of concatenating the 40-bit or 104-bit WEP key with a 24-bit initialization vector The encrypted payload and the initialization vector are sent to the access point The access point concatenates the WEP key with the initialization vector to seed the keystream for RC4 to perform an XOR binary operation on the encrypted payload to reveal the plaintext payload Unfortunately, an attacker who captures these frames possesses the plaintext challenge, the ciphertext challenge, and the initialization vector Because of the way that XOR operations work, the attacker would then know the keystream that was used, which is the concatenated initialization vector and the WEP key.

Although the attacker still does not know the WEP key, she can attempt to authenticate to the access point and use the keystream derived from the captured packets to encrypt the challenge and retransmit the captured initialization vector Note Several utilities available on the Internet automate this process of compromising shared key authentication..

network address translation (NAT) A process of converting IP addresses; most often used to allow one public IP address to be shared by multiple systems, each of which has only a private IP address. NAT features are often included for address management and security purposes in residential gateway devices. Network File System (NFS) A file system designed to allow diskless workstations to mount file systems from other computers. These mounted file systems appear to be local to the user and all of the applications running on the workstation. NFS uses a collection of remote procedure calls (RPCs) operating over UDP and TCP to affect connectivity. NFS is widely used as the protocol for sharing and connecting to files and folders on UNIX-based networks. network share A resource, such as a directory or a printer, provided by a Windows computer for access by other network users. network A collection of computers organized to share resources and data without manually transferring them via removable media. NIC See network adapter. NTFS file system The file system of choice for Windows XP computers. NTFS provides file-level security as well as additional features, such as compression and encryption. See also FAT32 file system; compression; Encrypting File System. null modem cable A cable used to connect two computers using their serial ports. The computers then communicate over the cable directly rather than through a network hub. The null modem cable provides a good temporary network solution, but it is too slow for permanent networking needs and is limited to connecting only two computers.

Part III: