Polynomial-Based Google Map Graphical Password System against Shoulder-Surfing Attacks in Cloud Environment

Table 1

The comparison among different graphical password systems.

	CCPGP	GMGP	P-GMGP	Extended
Resistance to the shoulder-surfing attacks	No	No	Yes	Yes
Number of challenge-response rounds	n	n	1	1
Login to multiple servers, simultaneously?	No	No	No	Yes
Storage load	Large number of pictures	No need	No need	No need