Dynamic Key Encryption Using the Embedded Three Pass Protocol for Securing TCP Streams in WiMAX Link

This paper proposes embedded three pass protocol (TPP) for securing TCP streams through the worldwide interoperability microwave access (WiMAX) link. TPP messages are embedded into either WiMAX frame headers or TCP header to secure TCP connection. The embedded TPP in WiMAX MAC layer headers ensure any messages flow through WiMAX link is protected. Even though TCP packets experience average delay up to 47.8 ms, TCP streams are well protected as all signals are encrypted dynamically. On the other hand, by embedding the TPP messages into TCP header, TCP delay decreases significantly to about 29.4 ms. However, only TCP streams are protected. If existing WiMAX link security is sufficient, the later method is preferred. However, embedded TPP in TCP header has more security risks as TCP connection can be failed if other unprotected WiMAX signal is attacked and existing WiMAX security is weak. Multiple links connection prefers embedded TPP in TCP header as TCP streams are protected end to end.