A Simple Image Encryption Based on Binary Image Affine Transformation and Zigzag Process

Table 12

Comparison of results on nonmedical images.

Image	Metric	Cipher image [34]	Cipher image [38]	Cipher image [39]	Cipher image [29]	Cipher image [44]	Cipher image of our algorithm
Lena	Vert. cor	−0.0024	0.003709	0.00085	−0.0016	0.0034	9,09e−05
	Hor. cor	0.0076	−0.00084	0.00080	0.0031	0.0026	−0.000257
	Diag. cor	0.003	−0.00018	0.00019	0.0067	0.0019	−0.000452
	Entropy	7.9992 < e < 7.9994	7.99748		7.9952	7.9992	7.9993
	NPCR	93,7457	>99.6	99.6553	>96	99,6201	99.6254
	UACI	32.3899	33.4	33.3377	31,79	33,4006	33.4604
Airplane (512 × 512)	Vert. cor	−0.0095				−0.0036	−0.000767
	Hor. cor	0.0025				−0.0017	0.00228
	Diag. cor	0.0009				−0.0020	−9.57e−05
	Entropy	7.9992 < e < 7.9994	7.99925			7.9990	7.9994
	NPCR	93.7482	99.5252			99.6178	99.604
	UACI	32.3293	33.38			33.589	33.4426
Baboon	Vert. cor	−0.0092				−0.0019	0.00136
	Hor. cor	0.0019				−0.0014	−0.000584
	Diag. cor	0.0049				−0.0013	−0.000473
	Entropy	7.9992 < e < 7.9994	7.9993			7.9991	7.9993
	NPCR	93.7483	99.9935			99.6109	99.6063
	UACI	31.7602	33.69			33.4757	33.4353