Abstract
The presented chapter elaborates fundamentals issues in information security, safety, and trust in industrial settings. The chapter introduces basics of information security that includes confidentially, integrity, and availability (CIA), which are some of the essential ingredients of information security. The chapter also discusses various reasons for security loop-holes prevalent in industrial setting. A majority of the chapter focuses on security framework and control implementation, which includes various authorizations and authentication methods. The shared secret systems, passwords, token systems, public key infrastructure (PKI), and biometrics system are most common methods used for authentication.