Block-Based Arnold Chaotic Map for Image Encryption

Abstract

This study proposes an encryption method in Arnold chaotic map based imagery. The uniqueness of the proposed method is to divide the image into smaller blocks, then each image is encrypted with the same chaotic map formula. Visually the results of image encryption are quite unique because they make the form of image encryption blocks that look different but actually have the same iteration. The chaotic map method is famous for its resistance to differential attacks. Therefore, the results of encryption from the proposed method need to be measured for performance against differential attacks. To measure the performance of the proposed method of measurement using measuring devices and UACI NPCR. Based on the results of the test we found a significant increase in the assessment of the UACI value but there was a decrease in the NPCR value. These results can be used as preliminary research for the development of methods in order to increase the value of UACI and NPCR at once.