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

Figure 7

Correlation analysis of the cameraman plain image and cipher image in three directions. (a) Horizontal correlation of the cameraman plain image. (b) Vertical correlation of the cameraman plain image. (c) Diagonal correlation of the cameraman plain image. (d) Horizontal correlation of the cameraman cipher image. (e) Vertical correlation of the cameraman cipher image. (f) Diagonal correlation of the cameraman cipher image.

(a)

(b)

(c)

(d)

(e)

(f)