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to Hayes compatible modems This connection allows full control over the phone, including the placing of calls to any number without the phone owner s knowledge Fortunately, this attack requires pairing of the devices to complete, and phones initially vulnerable to the attack have updated firmware to correct the problem To accomplish the attack now, the phone owner would need to surrender her phone and allow an attacker to physically establish the connection Bluetooth technology is likely to grow due to the popularity of mobile phones Software and protocol updates have helped to improve the security of the protocol Almost all phones now keep Bluetooth turned off by default, and they allow you to make the phone discoverable for only a limited amount of time User education about security risks is also a large factor in avoiding security breaches
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The 80211b protocol is an IEEE standard ratified in 1999 The standard launched a range of products that would open the way to a whole new genre of possibilities for attackers and a new series of headaches for security administrators everywhere 80211 was a new standard for sending packetized data traffic over radio waves in the unlicensed 24 GHz band This group of IEEE standards is also called Wi-Fi, which is a certification owned by an industry group A device marked as Wi-Fi certified adheres to the standards of the alliance As the products matured and became easy to use and affordable, security experts began to deconstruct the limited security that had been built into the standard 80211a is the wireless networking standard that supports traffic on the 5 GHz band, allowing faster speeds over shorter ranges Features of 80211b and 80211a were later joined to create 80211g, an updated standard that allowed the faster speeds of the 5 GHz specification on the 24 GHz band Security problems were discovered in the implementations of these early wireless standards Wired Equivalent Privacy (WEP) was a top concern until the adoption of 80211icompliant products enhanced the security with Wi-Fi Protected Access (WPA) 80211n is the latest standard and is still in draft form; it focuses on achieving much higher speeds for wireless networks The following table offers an overview of each protocol and descriptions of each follow
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80211 Protocol Frequency in GHz Speed in Mbps Modulation
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2 54 11 54 248 54 OFDM DSSS OFDM OFDM OFDM
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EXAM TIP The best place for current 80211 standards and upcoming draft standard information is in the RFCsYou can find them at wwwietforg/rfchtml The 80211b protocol provides for multiple-rate Ethernet over 24 GHz spread-spectrum wireless It provides transfer rates of 1 Mbps, 2 Mbps, 55 Mbps, and 11 Mbps and uses direct-sequence spread spectrum (DSSS) The most common layout is a point-tomultipoint environment with the available bandwidth being shared by all users Typical range is roughly 100 yards indoors and 300 yards outdoors line of sight While the wireless transmissions of 80211 can penetrate some walls and other objects, the best range is offered when both the access point and network client devices have an unobstructed view of each other The 80211a uses a higher band and has higher bandwidth It operates in the 5 GHz spectrum using orthogonal frequency division multiplexing (OFDM) Supporting rates of up to 54 Mbps, it is the faster brother of 80211b; however, the higher frequency used by 80211a shortens the usable range of the devices and makes it incompatible with 80211b The chipsets tend to be more expensive for 80211a, which has slowed adoption of the standard 80211g standard uses portions of both of the other standards: It uses the 24 GHz band for greater range but uses the OFDM transmission method to achieve the faster 54 Mbps data rates As it uses the 24 GHz band, this standard interoperates with the older 80211b standard This allows a 80211g access point (AP) to give access to both G and B clients The current draft standard, 80211n, improves on the older standards by greatly increasing speed It has a data rate of 248 Mbps, gained through the use of wider bands and multiple-input multiple-output processing (MIMO) MIMO uses multiple antennas and can bond separate channels together to increase data throughput All these protocols operate in bands that are unlicensed by the FCC This means that people operating this equipment do not have to be certified by the FCC, but it also means that the devices could possibly share the band with other devices, such as cordless phones, closed-circuit TV (CCTV) wireless transceivers, and other similar equipment This other equipment can cause interference with the 80211 equipment, possibly causing speed degradation The 80211 protocol designers expected some security concerns and attempted to build provisions into the 80211 protocol that would ensure adequate security The 80211 standard includes attempts at rudimentary authentication and confidentiality controls Authentication is handled in its most basic form by the 80211 AP, forcing the clients to perform a handshake when attempting to associate to the AP Association is the process required before the AP will allow the client to talk across the AP to the network Association occurs only if the client has all the correct parameters needed in the handshake, among them the service set identifier (SSID) This SSID setting should limit access only to the authorized users of the wireless network The designers of the standard also attempted to maintain confidentiality by introducing WEP, which uses the RC4 stream cipher to encrypt the data as it is transmitted
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