c# qr code zxing Part 6: Networking in C#

Generator QR Code ISO/IEC18004 in C# Part 6: Networking

Part 6: Networking
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On a conventional wired network, physical security is a given: If someone plugs a computer into your hub, you ll know about it immediately, and you can trace the physical wire back to the intruder s computer. On wireless networks, however, anyone who comes into range of your wireless access point can tap into your network and intercept signals from it. Finding open access points has become something of a sport; as we noted earlier in this chapter, participants call it war driving. Although some war drivers seek open access points just for fun, other users who find their way into your network present several risks:
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An intruder might be able to access the Internet using your connection, which could degrade the quality of your Internet 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. 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. 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.
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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 both of the following options:
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Wireless Equivalent Privacy (WEP) protects authorized users of a wireless network
from eavesdroppers by encrypting the data flow between the networked computer and the access point. Typically, WEP encryption uses a secret key that is either 64 bits or 128 bits in strength. (Confusingly, you may also see references to 40-bit and 104-bit keys, which refer to the unique portion of each WEP key that is separate from the common 24-bit initialization vector.) To enter a WEP key, you supply a string of ASCII or hex characters (5 ASCII or 10 hex characters 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. Although WEP offers reasonable security for a home network, it 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.
Part 6: Networking
23
Microsoft Windows XP Inside Out, Second Edition
Wi-Fi Protected Access (WPA) is a newer, stronger encryption scheme that was specif-
ically designed to overcome weaknesses of WEP. On a 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 may be able to add WPA compatibility via a firmware upgrade. Typically, configuring an access point to support WEP or WPA requires that you use a Webbased configuration utility. Figure 23-2, for instance, shows the configuration settings for an SMC 2804WBR Barricade, which combines a wired router and a wireless access point.
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