Image Encryption Using 4D Chaotic Map, Random Pixel Permutation, Image as a Key & DNA Encoding on Multiple Layers of a Chaotic Sequence

Digital security of an image cannot always be guaranteed using conventional encryption methods like symmetric and asymmetric ciphers. The study we performed is based on novel dynamic systems (4D chaotic maps), Random number permutation, key image, and DNA encoding. The suggested approach combines novel 4D chaotic maps having the concept of key image encryption in which an image is used as a key which is common for both the sender and the receiver. Based on the Random number Permutation, row and column vectors are generated using random numbers, and the channels of plain image are independently block-scrambled by scrambling column & row separately as per the random vectors, and XORed with the treated chaotic sequences. After that, key image which has a higher degree of content unpredictability is XORed with the chaotic sequence, and in the scheme culminating stage, DNA encoding was applied to further encrypt the image and corroborate the security.