Cryptanalysis and Enhancement of an Image Encryption Scheme Based on Bit-Plane Extraction and Multiple Chaotic Maps

Recently, an image encryption scheme combining bit-plane extraction with multiple chaotic maps (IESBC) was proposed. The scheme extracts binary bit planes from the plain-image and performs bit-level permutation and confusion, which are controlled by a pseudo-random sequence and a random image generated by the Logistic map, respectively. As the rows and columns of the four MSBPs are permuted with the same pseudo-random sequence and the encryption process does not involve the statistical characteristics of the plain-image, the equivalent secret key of IESBC can be disclosed in the scenario of known/chosen-plaintext attacks. This paper analyzes the weak points of IESBC and proposes a known-plaintext attack and a chosen-plaintext attack on it. Furthermore, we proposed an enhanced scheme to fix the shortcomings and resist the proposed plaintext attacks. The experimental simulation results demonstrated that the enhanced scheme is excellent in terms of various cryptographic metrics.