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The fourth generation technology of broadband wireless networks i.e. WiMAX (Worldwide Interoperability for Microwave Access) became popular due to its features like high speed internet access, large coverage area and interoperability for different type of devices. Non-Line of-sight propagation with lower frequency improvement makes WiMAX vulnerable to various security threats. Hence, authentication and authorization are used for protecting network from various attacks. Although there are standard authentication protocols in IEEE 802.16, but still WiMAX is vulnerable to attacks such as replay attack, DoS (Denial of Service attack), interleaving attack etc.
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