Cyber risk has become increasingly reported as a major problem for financial sector businesses. It takes many forms including fraud for purely monetary gain, hacking by people hostile to a company causing business interruption or damage to reputation, theft by criminals or malicious individuals of the very large amounts of customer information ("big data") held by many companies, misuse including accidental misuse or lack of use of such data, loss of key intellectual property, and the theft of health and medical data which can have a profound effect on the insurance sector. This book assesses the major cyber risks to businesses and discusses how they can be managed and the risks reduced. It includes case studies of the situation in different financial sectors and countries in relation to East Asia, Europe and the United States. It takes an interdisciplinary approach assessing cyber risks and management solutions from an economic, management risk, legal, security intelligence, insurance, banking and cultural perspective.