A Reputation-Based Approach Using Consortium Blockchain for Cyber Threat Intelligence Sharing

Algorithm 3

Consensus phase.

	Data: state: the state of a node, num: total number of nodes in the CTI sharing consortium network.
	Result: void
(1)	begin
(2)	switch state do:
(3)	case “leader” do:
(4)	for i = 1, i<=num, i++ do:
(5)	send valid threat proposal to node i
(6)	if number of ack message received <1/2num then:
(7)	update the index;
(8)	respond to client;
(9)	break
(10)	default do:
(11)	received the valid threat proposal from leader;
(12)	if valid threat proposal from leader is correct then:
(13)	update the index;
(14)	send ack message to leader;
(15)	break
(16)	end