Information Security, Image Random Encryption Technology, Computer Simulation Studies

Image random encryption! technique for information security is an international advanced area, it has wide application and prospect. The research product can be used directly to security verification. Hence it can bring great benefit to society, and can also accelerate the development of information science in related fields of our country.This dissertation's research includes several techniques, such as computer-generated hologram, image encryption and decryption, joint transform correlation, m-sequence, digital image processing and image transmission. In this thesis, theoretical research and computer simulation about these techniques are conducted.Following are the details:(1) LomannlllCGH and kino form are produced by computer, simulated experiments of image reconstruction is performed.(2) Double random phase encryption technique is simulated, its faulty tolerance is also analyzed and results of simulated experiments are given.(3) Random phase function is produced by m-sequence, and it is used to JTC system as key pattern. Furthermore, the simulation of the whole process is conducted.(4) An improved phase iterative algorithm is presented, and computer simulation is carried out.(5) A joint image encryption-transmission scheme is presented, and the software system is developed. Computer simulation shows the scheme is correct, and it's very practical.