Features: Start with a thorough introductory chapter; Provide topic from different perspectives offered by the collections of leading international researchers in the field; It contains selected contributions expanded from 5 IAPR International Summer School for Advanced Studies Biometrics for Secure Authentication: To review issues iris recognition, gait recognition, and touchless fingerprint recognition, as well as various aspects of face recognition; Discusses multibiometric systems, and machine learning techniques; Checking biometrics ethics and policies; Presents international standards in biometrics, including those in preparation.