Optimal Network Defense Strategy Selection Method Based on Evolutionary Network Game

Table 2

Defense strategy selection algorithm.

Input: Evolutionary network game model; Output: Optimal defense strategy
1	Initialize ;
2	Initialize strategy space and strategy density of the attack group;
3	Initialize strategy space and strategy density of the defense group;
4	Calculate return UA of attack player node (Equation (8));
5	Calculate return UD of defending player node (Equation (9));
6	Calculate probability of player node strategy transition (Equation (2));
7	Calculate time evolution of player group strategy density (Equation (10));
8	Introduce auxiliary function tanhz (Equation (12));
9	Solve equation set for equilibrium point (Equations (13) and (14));
10	Refine equilibrium point and screen evolutionary stability strategy;
11	Output optimal defense strategy;
12	End