An Extential Steganalysis of Information Hiding for F5

F5 is an information hiding algorithm based on frequency domain. It has been widely used because of its high-capacity and robustness. In recent years, many scholars have engaged in the field. In this paper, It is proposed for a extential steganalysis of information hiding for F5(ESF). By cropping IPEG image more times along the oblique direction, ESF can deal effectively with abnormal data and get better results. The experiment results show that ESF is more effective.