This book provides a state-of-the-art overview of electronic commerce security in consumer- and business-to-business applications, complete with end-of-chapter review questions and an extensive bibliography. The third edition reflects the latest technical advances and developments in areas such as mobile commerce, addressing a variety of electronic payment systems used around the globe. This edition also features a new chapter on Bitcoin and other cutting-edge cryptocurrencies, as well as increased coverage of PayPal and bankcards. A Solutions Manual and PowerPoint slides are available with qualifying course adoption.