Cryptanalysis and Improvement of Chaos-Based Image Encryption Scheme with Circular Inter-Intra-Pixels Bit-Level Permutation

Figure 2

Step of a known-plaintext attack: (a) plain image; (b) cipher image corresponding to (a); (c) scrambled image retrieved from (b); and (d) deciphering image of (b).

(a)

(b)

(c)

(d)