In a world that seems less safe and less certain by the day, security issues are impossible to overlook. Security goes far beyond the police and military personnel seen patrolling the bridges, tunnels and terminals of major cities. Equally important is the security of documents. Bank notes, checks, passports, lottery tickets and other important documents must be kept safe from fraud and forgery, and that means that features in those documents must be devised to prove authenticity. According to ...