Image Information Hiding Method for JPEG Data Flow

In this paper, a method of image information hiding for JPEG data flow is proposed. In this method, each complete field in the data flow of the original JPEG image is read first, and the secret signal is used to generate the COM self-made field and APPn self-made field conforming to the JPEG encoding protocol. The self-made fields include the mark code part and data part. Secondly, the generated selfmade field is embedded between two complete fields of the original JPEG data stream to obtain an encrypted JPEG image. Then the encrypted JPEG image data flow is saved or sent. Finally, secret signal is extracted from the encrypted JPEG image file by the mark code. Compared with the traditional method of spatial and frequency domain, the proposed method has the advantages of low complexity, large amount of embedded information, easy implementation, good security and invisibility.