A key agreement method for wireless body area networks

A secure and efficient key agreement method is required by Wireless Body Area Network, especially for intersensor/controller communication. The communicating parties share similar channel information at physical layer that the others cannot grasp. The physical layer information-based key generation and agreement will only pass check symbols from one side to the other side of the communication channel. Then the receiving side can recover the original information stored at the sending side from the received check symbols and the similar local information. This way can achieve both high security and efficiency. This paper further improves the security and efficiency of the above method.