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

Algorithm 1

Processing of a report on its nonspecified receiver (e.g., ).

	/∗When hears the report R sent by to ∗/
	if ( is a common neighbor of and )
	Add the report transmission record {, , IDcos, C} to the local list RTLT;
	if ( is the CoS node in R) {
	if ( is an endorsing node in R || is a common neighbor of and an endorsing node in R){
	Search the local list ETLT for the record of sending its endorsement of the event to .
	If not found, set flg0 = false, otherwise set flg0 = true;
	if (flg0 = false && count_i0 < s)
	//count_i0 is the number of 0-type ALERT messages for .
	sends a 0-type ALERT message for to ;
	}
	}
	else {
	if ( is the node prev in R || is a common neighbor of and the node prev in R){
	Search the local list RTLT for the record of the node prev sending report R to .
	If not found, set flg1 = false, otherwise set flg1 = true;
	if (flg1 = false && count_i1 < s)
	//count_i1 is the number of 1-type ALERT messages for .
	sends a 1-type ALERT message for to ;
	}
	}