The consideration of security requirements in the development of multi-agent systems is a very difficult task. However, only few approaches have been proposed that try to integrate security issues as internal part of the development process. Amongst them, secure Tropos has been proposed as a structured approach towards the consideration of security issues in the development of multiagent systems. In this paper we enhance secure Tropos by integrating to its stages: (i) a process for selecting amongst alternative architectural styles using as criteria the security requirements of the system; (ii) a pattern-based approach to transform security requirements to design, and (iii) a security attack scenarios approach to test the developed solution. The electronic single assessment process (eSAP) case study is used to illustrate our approach.
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