As modern technologies, such as credit cards, social networking, and online user accounts, become part of the consumer lifestyle, information about an individual's purchasing habits, associations, or other information has become increasingly less private. As a result, the details of consumers' lives can now be accessed and shared among third party entities whose motivations lie beyond the grasp, and even understanding, of the original owners. Anonymous Security Systems and Applications: Requirements and Solutions outlines the benefits and drawbacks of anonymous security technologies designed to obscure the identities of users. These technologies may help solve various privacy issues and encourage more people to make full use of information and communication technologies, and may help to establish more secure, convenient, efficient, and environmentally-friendly societies.