ABSTRACT
This chapter discusses a genetic algorithm (GA)-based method that can adjust the image such that the modified image after Joint Photographic Experts Group (JPEG) compression contains the authentication information in the discrete cosine transform coefficients of each block to authenticate the image. It examines the GA-based watermark-embedding method and describes the authentication procedure. In the fixed-length chromosome algorithm, the chromosome length is fixed and determined by the quality factor Quality factor of JPEG compression. GA is a randomized, parallel, and global search approach based on the mechanics of natural selection and natural genetics to find solutions of problems. GA starts with some randomly selected genes in the first generation, called population. Authentication of digital images can be carried out in two ways: digital signature and digital watermarking. Digital watermarking is categorized into three types: robust, fragile, and semifragile. Robust watermarking is used to protect the copyright of digital media.
