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

Table 4

The NPCRs and UACIs for differential attack analysis.

Images	NPCR	UACI
Cameraman 128128	99.6216	33.2842
Cameraman 256256	99.6109	33.3735
Cameraman 512512	99.5941	33.4795
Brain 128128	99.5544	33.3126
Brain 256256	99.5789	33.3460
Brain 512512	99.6094	33.4677
White 128128	99.6033	33.7762
White 256256	99.6506	33.4553
White 512512	99.6109	33.5130