Hide and Seek in JPEG Images

Recently, the JPEG images are the most common format for storing images. JPEG images are very abundant on the Internet bulletin boards and public Internet sites. So it attracted the attention of researchers as the main steganographic format. There are many new and powerful steganography and steganalysis techniques in JPEG images reported in the literature, in the last few years. In this paper, steganography and steganalysis in JPEG is presented with F5 and JHRF-(JPEG information hiding algorithm of resisting F5) algorithms. F5 is one of information hiding algorithms based on the frequency domain. It has been widely used because of its highcapacity and robustness. JHRF is steganalysis algorithm based on frequency domain for F5.To deal effectively with abnormal data and to obtain better results, JHRF uses embedding secret information using some rules. KEYWORDS-information hiding; steganography; DCT; F5; steganalysis