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

Table 2

Key sensitivity of encryption process.

Initial values	NPCR (%)	UACI (%)
x 1 + 10^−12	99.6215	33.3213
y 1 + 10^−12	99.6093	33.4764
z 1 + 10^−12	99.6002	33.7886
+ 10^−12	99.6307	33.6475