Image Encryption Using A Novel Orbital-Extraction Permutation Technique and Chaotic Key Generation

This paper presents an image encryption scheme that introduces a novel permutation technique named as orbital-extraction permutation. The proposed encryption scheme contains three important modules, i.e., the key generation module, the orbital-extraction permutation module, and dynamic chaotic substitution module. The key generation module utilizes the 2D Hénon map, a highly non-linear and unpredictable chaotic map, to generate cryptographic keys. The orbital-extraction permutation module reshuffles the pixels of the plain text image in a complex manner disrupting the inherent correlation within the neighboring pixels of the input image. The proposed permutation technique serves as a strong diffusion stage. Furthermore, for the confusion part of the encryption scheme, bit-XOR operations and chaotic substitution methods have been employed. The proposed scheme has been evaluated for key statistical security parameters. Results indicate the enhanced security and robustness of the proposed scheme with an information entropy of 7.9974 and a correlation coefficient of 0.007.