Wireless Networking in Software

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Wireless Networking
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Wireless networking is the transmission of packetized data by means of a physical topology that does not use direct physical links This definition can be narrowed to apply to networks that use radio waves to carry the signals over either public or private bands, instead of using standard network cabling Although some proprietary applications use point-to-point technology with narrowband radios and highly directional antennas, this technology is not common enough to produce any significant research into its vulnerabilities, and anything that was developed would have limited usefulness So the chapter focuses on point-to-multipoint systems, the two most common of which are the family of cellular protocols and IEEE 80211 The 80211 protocol has been standardized by the IEEE for wireless local area networks (LANs) Three versions are currently in production 80211g, 80211b, and 80211a At the time of writing, a fourth standard, 80211n, remains under development While the fourth standard is an IEEE draft specification, some manufacturers are
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already shipping products based on it The same situation occurred with 80211g hardware, but as most equipment is backward-compatible, consumers are generally assured of getting something that works The 80211n standard is due to be ratified in March 2009, at which time most vendors will release an update to ensure compliance Cellular phone technology has moved rapidly to embrace data transmission and the Internet The Wireless Application Protocol (WAP) was one of the pioneers of mobile data applications, but it has been overtaken by a variety of protocols pushing us to third-generation (3G) or fourth-generation (4G) mobile networks The 80211b standard was the first to market, 80211a followed, and at the time of writing 80211g products are the most common ones being sold These chipsets have also commonly been combined into devices that support a/b/g standards 80211n is on the horizon, with many manufacturers shipping devices based upon the draft specification Bluetooth is a short-range wireless protocol typically used on small devices such as mobile phones Early versions of these phones also had the Bluetooth on and discoverable as a default, making the compromise of a nearby phone easy Security research has focused on finding problems with these devices simply because they are so common The security world ignored wireless for a long time, and then within the space of a few months, it seemed like everyone was attempting to breach the security of wireless networks and transmissions One reason that wireless suddenly found itself vulnerable is because wireless targets are so abundant and so unsecured, simply because they are not necessarily attached to crucial infrastructure The dramatic proliferation of these inexpensive products has made the security ramifications of the protocol astonishing No matter what the system, wireless security is a very important topic as more and more applications are designed to use wireless to send data Wireless is particularly problematic from a security standpoint, because there is no control over the physical layer of the traffic In most wired LANs, the administrators have physical control over the network and can control to some degree who can actually connect to the physical medium This prevents large amounts of unauthorized traffic and makes snooping around and listening to the traffic difficult Wireless does away with the physical limitations If an attacker can get close enough to the signal s source as it is being broadcast, he can at the very least listen to the access point and clients talking to capture all the packets for examination Attackers can also try to modify the traffic being sent or try to send their own traffic to disrupt the system In this chapter, you will learn of the different types of attacks that wireless networks face
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