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Theft of service An intruder might be able to access the internet using your connection, which could degrade the quality of your internet service. Denial of service An intruder who is unable to connect to your network can still cause some degree of havoc by flooding the network with connection requests. With enough persistence, an attacker could completely deny legitimate users access to the network. Privacy violations An intruder with the right tools can monitor all data sent over the network, and can therefore see which websites you visit (along with your passwords for those sites), documents you download from a shared network folder, and so on. Theft or destruction of data Outsiders who successfully connect to your network can browse shared folders and printers. Depending on the permissions assigned to these resources, they can change, rename, or delete existing files, or add new ones. Network takeover An intruder who manages to log on to the network and exploit an unpatched vulnerability can install a Trojan horse program or tamper with permissions, potentially exposing computers on the LAN to attacks from over the internet.

Wired Equivalent Privacy (WEP) WEP is a first-generation scheme for protecting authorized users of a wireless network from eavesdroppers by encrypting the data flow between the networked computer and the access point. To enter a WEP key, you supply a string of ASCII or hex characters (5 ASCII or 10 hex charac-

All intranet locations are reachable and Internet locations are not reachable,

12

TABLE A-2

To prevent any of these dire possibilities, you can and should configure the best available security for your access point and all wireless devices on your network. Depending on your hardware, you should have a choice of one or more of the following options:

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except the address of the VPN server and locations available through other routes. (The Use Default Gateway On Remote Network check box is selected.) For most Internet-connected VPN clients, this behavior does not represent a prob lem because they are typically engaged in either intranet or Internet communica tion, not both.

ters for a 64-bit key; 13 ASCII or 26 hex characters for a 128-bit key). The key you provide when setting up your wireless adapter must match the key on your access point, and all devices on the network must use the same encryption strength either 64 or 128 bits. WEP suffers from some known security flaws that make it relatively easy for an attacker to crack the key using off-the-shelf hardware. As a result, WEP is inappropriate for use on any network that contains sensitive data. Most modern Wi-Fi equipment supports WEP for backward compatibility with older hardware, but you should use it only if none of the newer standards is available.

Wi-Fi Protected Access (WPA) WPA is a newer, stronger encryption scheme that was specifically designed to overcome weaknesses of WEP. On a small network that uses WPA, clients and access points use a shared network password (called a pre-shared key, or PSK) that consists of a 256-bit number or a passphrase that is between 8 and 63 bytes long. (A longer passphrase produces a stronger key.) With a sufficiently strong key based on a truly random sequence, the likelihood of an outside attack is very, very slim. Most network hardware that supports the 802.11g standard also supports WPA. With older hardware, you might be able to add WPA compatibility via a firmware upgrade. Wi-Fi Protected Access 2 (WPA2) Based on the 802.11i standard, WPA2 provides the strongest protection yet for wireless networks. It uses 802.1x based authentication and Advanced Encryption Standard (AES) encryption; combined, these technologies assure that only authorized users can access the network, and that any intercepted data cannot be deciphered. WPA2 comes in two flavors: WPA2-Personal and WPA2-Enterprise. WPA2-Personal uses a passphrase to create its encryption keys, and is currently the best available security for wireless networks in homes and small offices. WPA2-Enterprise requires a server to verify network users. WPA2 can work with all flavors of Wi-Fi, including 802.11b, 802.11g, and 802.11a. (WPA2 support will undoubtedly be included in 802.11n devices also when the specification is finalized in 2007.) All wireless products sold since early 2006 must support WPA2 in order to bear the Wi-Fi CERTIFIED label.

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