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Security-critical systems are challenging to design and implement correctly and securely. A lot of vulnerabilities have been found in current software systems both at the specification and the implementation levels. This paper presents a comprehensive approach for model-based security assurance. Initially, it allows one to formally verify the design models against high-level security requirements such as secrecy and authentication on the specification level, and helps to ensure that their implementation adheres to these properties, if they express a system's run-time behaviour. As such, it provides a traceability link from the design model to its implementation by which the actual system can then be verified against the model while it executes.
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