A Novel Image Encryption Algorithm Based on the Delayed Maps and Permutation-Confusion-Diffusion Architecture

Table 1

Comparison of histogram variance on different gray images.

Image name	Histogram variance
	Original images	Encrypted images
		Proposed	Ref. [43]
Lena	633400	841.2	982.6
Peppers	780660	952.8	1087.6
Boats	1535900	952.1	1044.9
Elaine	562670	830.9	993.7