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At the Black Hat conference in August 2006, David Maynor and Jon Johnny Cache Ellch shocked the Mac community by demonstrating to the world something that hackers had known for a long time: the Mac could be hacked, easily. Maynor and Ellch, two security professionals with long-time careers in the security industry, were able to release what is known as a proof-of-concept attack by exploiting the wireless Atheros drivers built into the Mac operating system. Using a script called setup.sh, which turned a Mac computer (with its wireless card turned on) into an access point, an attacker could gain control of an unsuspecting Mac user s laptop. Another hacker script, called bad_seed, could then be run from the host computer to exploit the vulnerability in the target computer s wireless driver; this would give an attacker access to a Terminal session on the target computer running root (which is a superuser that is allowed full control of the computer). The exploit was not released, but it did provide proof that the Mac community was a long way away from an operating system immune to wireless attacks. The concept used in the wireless exploit was not specific to Apple computers, but pointed instead to general flaws in wireless networking protocols as a whole. In this chapter, we ll cover securing Apple AirPort-based wireless networks. We ll begin with an introduction to wireless networking in general and then move into securing an Apple AirPort base station. Later in the chapter, to help show the importance of wireless security, we will showcase some common wireless hacking tools. We ll illustrate just how easy it is to listen in on wireless traffic, emphasizing why security measures are so important.

These measures produce significant improvement over the previous naive approach, but they don t place the result in a normal form, as the following shows: > simpDeriv e3;; val it : Expr = x*2+x*2

From a basic security perspective, wireless networks can be rather challenging. Most amateur wireless setups are usually left unsecured, exposing user credentials, e-mails, and other data submitted over the network to the world, causing unnecessary security risks to sensitive information. It is all too easy to plug in an open wireless device on a

However, you can t implement all simplifications using local rules; for example, collecting like terms across a polynomial involves looking at every term of the polynomial.

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wired network, causing a breach in the network that can then be exploited by someone tapping in from an outside location, such as a parking lot or nearby coffee shop These and other security threats make it important to practice good security when configuring wireless networks To properly secure a wireless network, it is key to first have a fundamental understanding of what a wireless network is A wireless network is different from an Ethernet network or a local area network (LAN), although the topologies often follow many of the same standards covered in 10 In fact, a wireless network is often referred to as a wireless LAN (wLAN) Logging in to a wireless network is like connecting to a hub with all the other users of that network.

If you do any sort of serious web surfing, you ll want to save some bookmarks. Figure 3 5 shows the Android web browser in Android 2.1. Next to the URL box, you ll see a star button that allows you to save the site as a bookmark. Clicking that button will bring up the screen shown in Figure 3 6. This is a very handy bookmark browser. It comes prepopulated with some common sites, but you can add your own. You can also use the tabs at the top to find sites by your browsing history or by the sites you view most often. You don t need to add a bookmark to see this menu. You can get back to this bookmark browser by clicking the Menu button while browsing a web page.

(fun x -> match x with pattern-rules -> expression) and is especially convenient as a way to define

But rather than traveling across copper wires to interconnect devices like LAN networks, wireless networks use channelized, low-powered radio waves running on the same frequencies as microwave ovens and cordless telephones The 24GHz band is pretty crowded these days, now that the Bluetooth technology also runs on this frequency This can often place a large quantity of traffic on these channels, causing data to get lost or fragmented in transit The speed and reliability of a wireless network depends on the hardware and proximity of the devices Ranges between wireless devices are typically limited to a few hundred feet The greater the distance, the greater the chance that packets will be intercepted NOTE: A key element to focus on when studying wireless security is what happens with data that is not properly delivered between wireless devices.

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