Image Encryption Algorithm Methodology Based on Multi-mapping Image Pixel

Abstract

Image encryption and decryption using a key sequence based on the multi-mapping method of an image pixel is proposed in this paper. The generated key sequences are based on the logistic map, elliptic curves (EC) and Henon map. In the beginning, the one-dimensional sequence is generated using logistic map for the bifurcation parameter and initial value. The generated sequences are XORed with image pixels as a first mapping step. Then the resulted pixels are XORed with key sequence based on elliptic curve random number generator (ECRNG) as a second mapping step. Finally, the resulted pixels XORed with key sequence generated by Henon map. The obtained cipher image introduces good cryptographic properties in the case of multi-mapping. The performance of the proposed scheme is analyzed by computing Histogram, Entropy, and Correlation between the original and encrypted images. The proposed method provides an immense improvement in the encrypted image.