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

Figure 1

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

(a)

(b)

(c)

(d)