Blockchain-Based Authentication Scheme with an Adaptive Multi-Factor Authentication Strategy

Algorithm 1

The election algorithm of LRaft.

	Input: The nodes participating in consensus , the number of nodes , follower node set , Candidate set , Timeout_Max
	Output: Leader
	Initialization:
	//Initializing the blockchain and flags for follower nodes and candidate nodes
(a)	For follower node in F, . For candidate node in , .
(b)	For node in , set the initial
	Procedure:
	while receive request from user or detect the failure of Leader do:
	//Start new election
	(I) For candidate nodes:
	for ;
	Set timeout ()
	//Election timeout occurs, candidate nodes invite votes to win the election
	if timeout do:
	RequestVote
	end if
	(II) For follower nodes:
	while ReceiveRequestVote do:
	//Check whether the candidate node is legitimate and has the latest blockchain status
	if in anddo:
	SendVote
	else do:
	RefuseVote();
	end if
	(III) For leader node:
	if winElection() do:
	//The Leader node performs the block generation operation.
	BecomeLeader
	GenerateNewBlock()
	SendCommitMessage()
	end if
	end while
	return Leader