DDoS Defense Method in Software-Defined Space-Air-Ground Network from Dynamic Bayesian Game Perspective

Table 1

Notations and significance.

Notations	Significance
	DDoS attacker
	Defender (SAG-SDN controller)
	Using attack-method-m
	Using defense-method-n
	Probability of using attack-method-m
	Probability of using defense-method-n
	Cost of using attack-method-m for attacker
	Cost of using defense-method-n for defender
	Utility of attack-method-m’s success
	Penalty for attacker after being detected
	Total resources of SAG-SDN controller
	Numbers of attack methods
	Utility of DDoS attacker
	Utility of defender
	Prior belief of defender about the type of network
	Correction of prior belief