Image Security System Using Playfair Cipher and Modification of Electronic Code Book (ECB) Algorithm

Abstract

The image as output from a data recording system can be optical in the form of a photograph. In the image there is a pixel value. Image elements (Pixels) are part of an image or the smallest element of a digital image that can be seen by the eye. Image pixels can be converted to 8 binary digits (bits). The first to fourth bits are called the Least Significant Bit (LSB) and the fifth to eighth bits are called the Most Significant Bit (MSB). The purpose of this research is to compare the security level of image encryption using the Playfair combined cipher method and electronic code book modification using 2 other methods, namely Playfair cipher and electronic code book modification. The data used in this study are grayscale and RGB images and keys that have been determined with several characters. The results obtained show that security using a combination of the Playfair cipher method and electronic code book modification is safer than image security using the other 2 methods, namely Playfair cipher and electronic code book modification based on visual calculations, differential analysis, and correlation coefficient analysis.