Design and Simulation of Lightweight Identity Authentication Mechanism in Body Area Network

Algorithm 3

Information access process based on the security level of sensor node.

(1).	//INPUT: request access to information.
(2)	//OUTPUT: physiological information collected by nodes.
(3)	BEGIN
(4).	Doctors send request message to ;
(5).	certifies doctors according to in the message;
(6)	IF the certification is successful, judge the safety level of medical sensor equipment according to ;
(7).	IF ;
(8).	sends physiological messages collected by to doctors;
(9).	ELSE ;
(10).	sends unable to process message to doctors;
(11).	After receiving the , the doctor sends the request message to again;
(12).	END IF
(13).	judges the state of the human body according to Algorithm 2;
(14).	IF the human body is in the normal state, execute Algorithm 1 for authentication;
(15).	IF the authentication is successful, looks up the authority table and sends the information;
(16).	ELSE Authentication failed;
(17).	END IF
(18).	ELSE the human body is in an emergency;
(19).	Send physiological information to within safe distance;
(20).	END IF
(21).	ELSE Authentication failed. No message will be sent.
(22).	END IF
(23).	END