An improved matching algorithm of Web service security concerns is proposed in this paper. It performs matching requirement and capability security concerns of both consumer and provider. WS-SP specifies the security requirements or capabilities of different web service participants. Security requirement/capability of a participant is one of the most important non-functional properties of a web service. The security concerns addressed within this paper emphasis on the security of a message (integrity and confidentiality) transmitted between the two participants. The proposed matching algorithm states matching of a simple policy and complex policy of WS-SP. In addition, a generalized matching algorithm is introduced to get the best-matched provider from a list of available providers for consumer requirements.
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