Optical Information Cryptosystem Based on Structured Phase Encoding -- Encryption Decryption with Optical Transform -- Optical Cryptosystems Based on Spiral Phase Modulation -- Image Cryptosystem for Different Kinds of Image Using Improved Arnold Map -- Image Encryption Using A Chaotic/Hyperchaotic Multidimensional Discrete System -- Video Cryptosystem Using Chaotic Systems -- Neural Network Image Restoration Techniques.