Quantum Cryptography -- New OVDs for Personalized Documents Based on Color Holography and Lippmann Photography -- Distortion- and Noise-Robust Digital Watermarking Using Input and Fourier-Plane Phase Encoding -- Steganography and Encryption Systems Based on Spatial Correlators with Meaningful Output Images -- Optoelectronic Information Encryption with Incoherent Light -- Information Hiding: Steganography and Watermarking -- Watermarking Streaming Video: The Temporal Synchronization Problem -- Secure Display Using Encrypted Digital Holograms -- Compression of Digital Holograms for Secure Three-Dimensional Image Storage and Transmission -- Optical Image Encryption Using Optimized Keys -- Polarization Encoding for an Optical Security System -- Stream Cipher Using Optical Affine Transformation -- Applications of Digital Holography for Information Security -- Gait-Based Human Identification Using Appearance Matching -- 2-D Periodic Patterns for Image Watermarking -- Image Steganalysis -- Public-Key Cryptography: An Overview of some Algorithms.Optical and Digital Techniques for Information Security is the first book in a series focusing on Advanced Sciences and Technologies for Security Applications. This book encompases the results of research investigation and technologies used to secure, verify, recognize, track, and authenticate objects and information from theft, counterfeiting, and manipulation by unauthorized persons and agencies. This Information Security book will draw on the diverse expertise in optical sciences and engineering, digital image processing, imaging systems, information processing, computer based information systems, sensors, detectors, and biometrics to report innovative technologies that can be applied to information security issues. The Advanced Sciences and Technologies for Security Applications series focuses on research monographs in the areas of: -Recognition and identification (including optical imaging, biometrics, authentication, verification, and smart surveillance systems) -Biological and chemical threat detection (including biosensors, aerosols, materials detection and forensics) -Secure information systems (including encryption, and optical and photonic systems). The series is intended to give an overview at the hightest research level at the frontier of research in the physical sciences.