부산대학교 도서관

With the development and popularization of computer and Internet, information communication plays an irreplaceable role in the modern society. Security problems of the information exchange processing is put on the agenda. While the image as one of the most effective information carrier, has been widely used in various fields, such as residents living, national security, etc. How to ensure the safety of image transmission in the processing of nature was widespread attention, has become an important research direction in the field of information security the security of image. At present, has proposed a series of image encryption algorithm, the image encryption algorithm based on Fourier transform is a hot research topic, attracted a lot of attention. We studies and implements the image encryption algorithm based on double random phase encoding (DRPE) in this paper, implement the known plaintext attack method based on the understanding of the algorithm. In the encryption process, the first step is generating two random phase matrix, and modulating the image as a cipher image using the random phase function as the key. But because of the linear properties of the algorithm itself, the algorithm is not robust to the attacks, the simulation results also show this point.