An Efficient Diffusion Scheme for Chaos-Based Digital Image Encryption

Table 3

Testing results when using standard map.

Test	1 round		2 rounds		3 rounds		4 rounds
Items	Proposed	Wang’s	Proposed	Wang’s	Proposed	Wang’s	Proposed	Wang’s
NPCR	99.59%	49.87%	99.61%	99.61%	99.60%	99.61%	99.63%	99.60%
UACI	33.43%	16.75%	33.48%	33.46%	33.48%	33.48%	33.52%	33.46%
Times (ms)	103.4	101.8	206.8	203.6	310.2	305.4	413.6	407.2