A comparison of wi-fi and wimax with case studies - Florida State ...
A comparison of wi-fi and wimax with case studies - Florida State ...
A comparison of wi-fi and wimax with case studies - Florida State ...
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4.3.1.2.4.2. Overall Analysis<br />
Figure 4-5 Encryption Frame Structure <strong>and</strong> Process<br />
Learning from the experience from IEEE 802.11, the IEEE 802.16 working group faces<br />
security threats both in the MAC <strong>and</strong> PHY levels. 802.11 only has protections in the MAC level<br />
cannot present against attacks from PHY-Level. 802.16 progression has many good functions,<br />
however it also brings <strong>wi</strong>th it an increase <strong>of</strong> threats to users<br />
The initial st<strong>and</strong>ard IEEE 802.16-2001 requires an attacker to put real equipment between<br />
SS <strong>and</strong> BS <strong>and</strong> also operate at a frequency <strong>of</strong> 10 to 66 GHz. The IEEE 802.16e adds mobility to<br />
the st<strong>and</strong>ard; however it creates a security risk. Now, an attacker’s physical position is not really<br />
constrained <strong>and</strong> the management messages are much weaker than IEEE 802.11.<br />
With radio transmission, there is a great risk. Anyone who has a proper well located receiver<br />
can intercept the channel. So the designers have to establish a safety mechanism. The other threat<br />
is that anybody who has a correctly con<strong>fi</strong>gured radio transmitter can access the <strong>wi</strong>reless network.<br />
Through this weakness, an attacker can make up or modify frames from authorized organizations.<br />
Therefore there must be a procedure to protect the transmitting data. Furthermore, the<br />
interference <strong>and</strong> distance may also give attackers a chance to intrude the system or two systems<br />
which cannot connect to each other directly. Thus, how to protect a system <strong>and</strong> examine the<br />
received data are also very important to designers.<br />
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