The widespread deployment of computing systems and the Internet has changed how people interact with each other and as well as with automated machine systems. The security in this cyberspace has developed as an area of concern with the human users often being referred to as the “weakest link.” Our research focuses on the human aspects of cybersecurity especially how to promote effective risk communication and secure human decisions in various application domains. Examples include users’ trust and usage of automated anti-phishing aids when classifying phishing emails, communicating potential risks associated with mobile applications, and examining drivers’ interaction with autonomous vehicles during potential cyberattacks in driving automation systems.