The article defines banks, a bank's internal security service, security, threat, danger, and risk. It also defines a bank's risk profile which shows what elements and functions in the system may be threatened, highlights the dangers, and indicates their seriousness. The article lists elements to be protected (such as customer, assets, and the bank's know-how) and summarizes protection obejectives. It suggests the development of a protection strategy and emphasizes the need for coordinated security measures. Also discussed are the necessity of a basic security policy and principles and the general security responsibility of employees. Finally, the organization of bank security as a reflection of the enterprise and the dangers threatening it are discussed. The discussion covers criteria for a security system, the introduction of specialized insurance, and specialized fields of activity such as protection measures, internal investigations, and special insurance cover. Other topics include security tasks, responsibilities, organizational role, technical management, staff instruction, and security inspection and control. Eight references are provided.