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Increasingly, engineers need to approach security and software engineering in a unified way. This paper presents an approach to the formal analysis of security requirements that is based on model-checking and uses the concept of suspicion to guide the search for threats and security vulnerabilities in requirements. It proposes an approach to security analysis that favours exploration of a system's state space based on what is abnormal or suspicious to find threats and vulnerabilities, instead of ironclad security proofs that try to demonstrate that a system is secure; as this paper shows, such security proofs can often be misleading.
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