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It is relatively easy to spoof a MAC address. Many software products exist that let an intruder modify the MAC address on a wireless network adapter. Most APs require that you manually enter MAC addresses. For networks with large numbers of wireless clients, this means a lot of work for administrators. In addition, most APs have a limit to the number of MAC addresses you can authorize. MAC filtering can stop an unauthorized computer, but not an unauthorized user. If an intruder gains access to a computer that has an approved MAC address, the intruder can gain access to the wireless network.

You ve significantly simplified the code again. The nicest thing about Hibernate Example queries is that an Example is just an ordinary Criterion. You can freely mix and match query by example with query by criteria. Let s see how this works by further restricting the search results to users with unsold Items. For this purpose, you may add a Criteria to the example user, constraining the result using its items collection of Items:

Every infrastructure network is named with a service set identifier (SSID). This name distinguishes the network from other wireless networks. By default, most APs broadcast their SSID so that wireless clients can easily locate and connect to the network. SSID broadcasting provides a great deal of convenience because wireless clients (especially those that roam among different wireless networks) can easily detect networks without requiring much configuration from the user. You can disable SSID broadcasting on most APs, which can prevent casual intruders from discovering a network. However, intruders who are looking for your network will likely be able to find it anyway. Several software programs exist that can scan for wireless networks and identify the SSID of a network, even if SSID broadcasting is disabled.

Configuring Wireless Connections 15-35

public List findUsersByExample(User u){ Example exampleUser = Example.create(u) .ignoreCase() .enableLike(MatchMode.ANYWHERE); return getSession().createCriteria(User.class) .add( exampleUser ) .createCriteria("items") .add( Restrictions.isNull("successfulBid") ) .list(); }

Typically, the convenience of using SSID broadcasting outweighs the slight security advantage that disabling broadcasting offers.

Note Several tools exist that can help users locate wireless networks, even if SSID broadcasting is turned off. As an administrator, you can use these tools to help evaluate the security of your own wireless network and identify rogue wireless networks in your organization. Two popular tools include NetStumbler, which you can find at http://www.netstumbler.com, and AirSnare, which you can find at http://home.comcast.net/~jay.deboer/airsnare.

Even better, you can combine User properties and Item properties in the same search:

Wired Equivalent Privacy (WEP)

Wired networks normally require a physical connection in order to be compromised. In wireless networks, because the data is broadcast using radio, intruders can intercept the signals. If those signals are not encrypted, intruders can view the data being transmitted. Wired Equivalent Privacy (WEP) is one of two wireless encryption standards supported by Windows XP Professional (the other being Wi-Fi Protected Access, which is covered in the next section). WEP is the encryption standard that is specified by the IEEE 802.11 standard. WEP provides encryption services to protect authorized users of a wireless LAN from eavesdroppers. WEP functions by using a shared key to encrypt packets of data before transmitting them over a wireless network. This shared key is generated by using 40-bit or 64-bit secret key encryption, and then adding a 24-bit initialization vector (IV) to the end of that key. The shared key is set in place for a network, but a new IV is generated randomly for each packet of data that is transmitted over the network. Unfortunately, WEP is not as strong as its designers had hoped. There are two basic shortcomings in the standard WEP protocol:

public List findUsersByExample(User u, Item i) { Example exampleUser = Example.create(u).ignoreCase().enableLike(MatchMode.ANYWHERE); Example exampleItem = Example.create(i).ignoreCase().enableLike(MatchMode.ANYWHERE); return getSession().createCriteria(User.class) .add( exampleUser ) .createCriteria("items") .add( exampleItem ) .list(); }