With the increasing crime rate involving identity theft with counterfeited and forged documents, optical document security has become a hot topic among professionals in a wide range of occupations, from banking and criminal investigation, to forensics and immigration control. Now in its third edition, the popular Artech House book Optical Document Security has transformed from a compilation of related topics on the subject, to a comprehensive and cohesive treatment of all aspects of document security written by a leading expert with decades of experience. This completely revised and updated edition brings professionals and students to the cutting-edge of this field with new coverage of critical topics, such as paper-based security, printed security, security evaluation and features, and biometrics. The book contains over 150 illustrations, including actual security documents, and features an invaluable appendix with samples of important security features. CD-ROM Included! Features numerous full-color sample images that support key topics discussed throughout the book.