Triple Layer Image Security using Bit-Shift, Chaos, and Stream Encryption

One popular image security technique is image encryption. This research proposes an image encryption technique that consists of three encryption layers, namely bit-shift encryption, chaos-based encryption, and stream encryption. The chaotic algorithm used is Arnold chaotic map, while the stream cipher algorithm used is RC4. Each layer has different cryptology characteristics in order to obtain safer image encryption. The characteristics of cryptology are permutation, confusion, diffusion, and substitution. The combination of the proposed encryption method aims to encrypt images against various attacks, especially attacks on statistics and differentials. The encryption method testing is done by various measuring instruments such as statistical analysis, namely entropy information, avalanche effect, and histogram, differential analysis, namely UACI and NPCR, visual analysis using PSNR and SSIM, and the ratio of error bits. Based on the results of the measurements obtained from the experiments that our proposed encryption method can work very well by various measuring instruments. The decryption process can also work perfectly where the decrypted image is the same as the original image proven by the infinity value in PSNR, and the value of 0 is generated on the SSIM and BER measuring devices.