En-Route Message Authentication Scheme for Filtering False Data in WSNs

Algorithm 2

Processing of ALERT message.

	/∗When hears an x-type ALERT message for reported by to .∗/
	if ( has heard the ALERT message) ignore this ALERT message;
	else if ( is exactly ){
	if ( is not a neighbor of ) discard this ALERT message;
	else {
	switch (x){
	case 0: count_i0++; break;
	case 1: count_i1++; break;
	}
	}
	}
	else if (it is a broadcast ALERT message) {
	//The ALERT message needs to be forwarded.
	if ( is a neighbor of && does not hear any node unicast this ALERT message to )
	unicasts this ALERT message to ;
	}