This paper presents a qualitative analysis of security aspect of Web-Based applications that utilize Service Oriented Architecture (SOA). The architectural solutions that address security requirements are examined and compared with other quality attributes relevant to web-based systems. More specifically, a trade off analysis based on ATAM performed to show the correlation between security and other system wide qualities related to the successful selection of SOA. The optimal architectural solution should not only meet the security requirements of a web-based system but also meets other QAs such as performance, availability, usability, modifiability, etc.
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