Agree to Disagree: Security Requirements are Different, but Mechanisms for Security Adaptation are Not

We describe a dialogue between a proponent and an opponent of the proposition security is not just another quality attribute in self-adaptive systems". The dialogue is structured in two steps. First we examine whether security requirements are different from other system-level requirements. Our consensus is that security requirements require specific methods for elicitation reasoning and analysis. However other requirements (such as safety usability and performance) also require specific techniques. Then we examine the adaptation mechanisms for security and compare them with other properties. Our consensus is that most adaptation techniques can be applied to maintain security and other requirements alike.