Most organizations are rapidly adopting flexible development methods. They allow you to respond in a timely manner to changing conditions and significantly reduce development costs. However, historically, security and agile techniques have never been friends with each other. This book will help you understand what security is, what threats exist, and in what language security specialists describe what is happening. You will learn to model threats, measure the degree of risk, create software constantly keeping security in mind. The publication will be useful to all specialists whose responsibilities include ensuring the information and operational security of organizations, developers who use flexible methods of application development, for whom Scrum and Kaizen are not empty words.