A Trust-Game-Based Access Control Model for Cloud Service

Table 1

Meanings of symbols.

Symbols	Meanings
	entities of system
	Trust function
	Weight of trust function
	Trust between and
	level trust level
	Trust decision
	Decay time factor
	Risk function
	Service level
Level	The level of a trust tree
	Feedback weight factor
	Feedback entities of
	Predicted probability of
	Evaluation error at time