[Retracted] Vulnerability Digging for Software-Defined Network Controller Using Event Flow Graph Analysis

Algorithm 2

Topk_FrequentSubGraphMining(GS, ).

	Inputs: event flow graph set GS, minimum frequency
	Outputs: frequency subgraph set S
(1)	Sort nodes and edges in GS by frequency
(2)	Remove nodes and edges with low frequency
(3)	Relabel the remained nodes and edges by frequency
(4)	all frequent 1-edge subgraph
(5)	Sort subgraphs in in DFS dictionary order
(6)	S
(7)	for each edge do
(8)
(9)	Subgraph_Mining(GS, S, s)
(10)	GSGS – e
(11)	if | GS | <
(12)	break