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

Figure 4

Original images and their cipher images. (a) Original cameraman 128 × 128. (b) Original cameraman 256 × 256. (c) Original brain 256 × 256. (d) Original white 256 × 256. (e) Original black 256 × 256. (f) Cipher cameraman 128 × 128. (g) Cipher cameraman 256 × 256. (h) Cipher brain 256 × 256. (i) Cipher white 256 × 256. (j) Cipher lack 256 × 256.

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