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

Algorithm 1

Authentication protocol under normal circumstances.

(1)	//INPUT: The excitation response pairs generated by PUF
(2)	//OUTPUT: Authentication success/failure message
(3)	BEGIN
(4)	Execute butterfly seed generation algorithm to generate and key , ;
(5)	and sensor nodes simultaneously execute pseudo-random sequence generator to generate ;
(6)	The sensor node calculates the value of by , and then sends it to ;
(7)	reads the database to get , and calculates by ;
(8)	IF the error between and is within the acceptable range, ;
(9)	THEN authenticates the sensor node successfully, considers the sensor node to be a trusted entity, and sends authentication success message, ;
(10)	ELSE send authentication failure message, ;
(11)	calculates by and sends it to sensor node;
(12)	END IF
(13)	IF the error between and is within the acceptable range, ;
(14)	THEN the sensor node authenticates successfully and considers as a trusted entity, and sends an authentication success message, ;
(15)	ELSE send authentication failure message, ;
(16)	END IF
(17)	END