An Image Encryption Algorithm Based on Hyperchaotic System and Variable-Step Josephus Problem

Table 11

Performance comparisons with the existing methods for cameraman image in size 256256.

Method	NPCR (%)	UACI (%)	Entropy	Correlations
				Horizontal	Vertical	Diagonal
[24]	99.5590	33.4439	7.9971	0.0047	−0.0066	0.0031
[28]	99.6047	33.5050	7.9963	−0.0074	0.0069	−0.0191
[31]	99.5620	31.1169	—	0.0002	0.0027	0.0031
[17]	99.60	33.4495	7.9031	0.0094	0.0023	−0.0031
[32]	99.6445	33.6711	7.9975	0.0072	−0.0113	−0.0065
[33]	99.6124	33.6435	7.9976	0.0010	−0.0048	−0.0080
[34]	99.6114	33.4682	7.9972	0.0014	0.0027	−0.0004
Proposed	99.6109	33.3735	7.9976	−0.0046	0.0011	0.0159