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Mobile WiMAX or IEEE 802.16e gives the access of Broadband Wireless even when the station is moving. But, as always Wireless environment is more open to threats; various threats exist over Mobile WiMAX like "Downgrade Attack", "Key Space Vulnerability" and "Initial Network Vulnerability", and "Denial of Service (DoS)". In this paper, the authors are proposing solution for one of the main Threat which is Denial of Service attack. The proposed solution is based on Puzzle approach. As, of more critical environment of Mobile-WiMAX, they have proposed use of Time Stamp and Nonce Variable for providing the more secure environment prone to DoS.
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