A Novel Differential Game Model-Based Intrusion Response Strategy in Fog Computing

Table 1

The list of symbols' meanings.

Symbol	Notation
	Attacker’s strategy: intrusion frequency for each fog node at time , and it is the control variable of the attackers
	Defender’s strategy: forbidding rate for system access at time , and it is the control variable of the IDS
	System memory resource occupancy
	The incomes of the attacker: expectation of invasion success
	The incomes of the defender: access amount of legal users
	The gains of the attacker
	The gains of the defender
	Total access amount of system at
	Forbidding factor
	System capacity: is enabled when the total access amount exceeds
	Proportion of legal users in