An Efficient Diffusion Scheme for Chaos-Based Digital Image Encryption

Table 1

Testing results when using cat map.

Test	1 round		2 rounds		3 rounds		4 rounds
Items	Proposed	Wang’s	Proposed	Wang’s	Proposed	Wang’s	Proposed	Wang’s
NPCR	99.61%	50.51%	99.62%	99.61%	99.62%	99.60%	99.60%	99.61%
UACI	33.41%	16.86%	33.51%	33.47%	33.46%	33.45%	33.51%	33.48%
Times (ms)	7.8	6.7	15.6	13.4	23.4	20.1	26.8	31.2