Identification and prevention of impersonation attack based on a new flag byte

Security plays an important role in wireless communication. While the cryptographic system is widely used in wireless communication, recent trends shift attention to security in some new ways. In this study, we propose a new strategy about how to identify and defense the impersonation attacks. The strategy utilize the transmission data information to generate the differential flag byte, establishing the correlation of that current flag byte of transmission data frame was determined by the relevant parameter of last frame. After establishing the generating equation, we analyze the limitations of an attacker in time and space. It is shown that in the stable environment, the user can identify the attack by setting the appropriate threshold.