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Cracking wireless networks with KisMAC is possible only if a second wireless network interface is installed on the machine. The second network interface runs in a passive monitoring mode, while the first active network interface sends out probe requests and waits for answers. Be aware that this is no longer the bleeding edge of hacking technology, but it is still very effective in testing out the hackability of your network. Packet reinjection is a WEP cracking technique used to crack wireless networks. With this attack, KisMAC will try to send captured packets of data in order to cause another computer to respond. If the computer responds, KisMAC will send these packets repeatedly. If KisMAC detects any answers, then it will go into injection mode. Injection mode generates a lot of traffic, causing more easily captured pieces of data to be generated. Wireless networks with WEP can be broken within an hour, sometimes only ten minutes, maybe even five. Many wireless access points offer a key generation process using an easy-to-remember passphrase. Unfortunately, many wireless manufacturers implemented a very dangerous algorithm, called the Newsham 21-bit attack, for the generation of 40-bit WEP keys. This algorithm generates keys with an effective strength of only 21 bits. KisMAC is able to brute-force, or attempt all possible combinations until the correct password combination is found (see Figure 12 22), finding these keys quickly. Wireless access points from Linksys, D-Link, Belkin, and Netgear are confirmed to be vulnerable to the Newsham 21bit attack.

This app provides offline road and topographic maps for times when you re traveling out of cell tower range. It s aimed at outdoor sports, but it s still very useful for traveling to rural areas.

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The next example turns to a traditional application area for functional programming: describing digital hardware circuits and symbolically verifying their properties. We assume a passing familiarity with hardware design, but if you haven t looked inside a microprocessor chip for some time, a brief recap is included in the About Hardware Design sidebar. In this example, you model circuits by propositional logic, a simple and familiar symbolic language made up of constructs such as AND, OR, NOT, and TRUE/FALSE values. You then implement an analysis that converts propositional logic formulae into a canonical form called binary decision diagrams (BDDs). Converting to a canonical form allows you to check conditions and properties associated with the digital circuits.

Most network interfaces that are available are PCMCIA cards, which is an interface that MacBook and MacBook Pro users cannot use because of the lack of a PCMCIA interface on the machines. The Netgear MA-111 USB adapter is a good alternative for Mac users. However, make sure to check the KisMAC site before purchasing a card, and make sure it is still supported or that there aren t other interfaces that might be more readily available to purchase for the Mac.

Numeric types aren t implicitly converted conversions between different numeric types must be made explicitly. You do this by using overloaded conversion operators. These work the same way as overloaded infix operators such as + and *. Table 3-4 shows the primary conversion operators.

If a rogue access point is suspected on the network, it is possible to use KisMAC to quickly locate the WAP. If you have a GPS unit, the Map menu provides users with the

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ability to set their current position on a map and then follow the wireless signal to the rogue access point s source using signal strength readings. To set up a map, you will need to import an image and switch to the Map tab. You should now see a map. Click the Set Waypoint 1 entry in the Map menu and click a position in the map for which you know the geographical position. KisMAC will now ask you for this position. If you have a GPS device attached to your computer, your current position is set as the default coordinates. Now use the Set Waypoint 1 entry to set up a second waypoint. After you have set up these two points, KisMAC can use the image as a map (see Figure 9-22). Networks are automatically displayed. You can also show your current position by clicking the Current Position entry in the Map menu.

This is also known as Sherpa on some phones. Geodelic finds nearby restaurants, cafes, attractions, and so on. You can browse by category of food or distance.

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