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

Table 3

Key sensitivity of decryption process.

Initial values	NPCR	UACI	MSE	PSNR
x1 + 10^−10	99.5895	33.9695	11341	7.5841
y1 + 10^−10	99.5819	33.2737	11509	7.5201
z1 + 10^−10	99.5560	33.4204	11582	7.4928
+ 10^−10	99.6200	33.4349	115891	7.4903