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In all walks of life the way of communication is transformed by the rapid growth of wireless communication and its
pervasive use. A wireless network which is fixed and richer in bandwidth is specified as IEEE 802.16, promoted and
launched by an industrial forum is termed as Worldwide Interoperability for Microwave Access (WiMAX). This technology enables seamless delivery of wireless broadband service for fixed and/or mobile users. The obscurity is the
long delay which occurs during the handoff management in every network. Mobile WiMAX employs an authenticated
key management protocol as a part of handoff management in which the Base Station (BS) controls the distribution of
keying material to the Mobile Station (MS). The protocol employed is Privacy Key Management Version 2- Extensible
Authentication Protocol (PKMV2-EAP) which is responsible for the normal and periodical authorization of MSs,
reauthorization as well as key refreshing. Authorization key (AK) and Traffic Encryption key (TEK) plays a vital role in
key exchange. When the lifetime of key expires, MS has to request for a new key to BS which in turn leads to repetition
of authorization, authentication as well as key exchange. To avoid service interruption during reauthorization , two
active keys are transmitted at the same time by BS to MS. The consequences of existing work are hefty amount of
bandwidth utilization, time consumption and large storage. It is also endured by Man in the Middle attack and
Impersonation due to lack of security in key exchange. This paper designs an automatic mutual refreshing of keys to
minimize bandwidth utilization, key storage and time consumption by proposing Previous key and Iteration based Key
Refreshing Function (PKIBKRF). By integrating PKIBKRF in key generation, the simulation results indicate that 21.8%
of the bandwidth and storage of keys are reduced and PKMV2 mutual authentication time is reduced by 66.67%. The
proposed work is simulated with Qualnet model and backed by MATLAB for processing and MYSQL for storing keys.
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