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Nowadays, Web services are the leading solution for solving the problem of information systems' integration. Web services are based on the service oriented architecture (SOA). Preserving privacy of web services is one of the main challenges during their interaction. Therefore, minimizing the number of the disclosed credentials that are required for accessing the web services resources during the interaction is a desirable behavior. Credentials generalization and substitution and credentialsdoi:10.5815/ijmecs.2016.10.07 fatcat:ojhqxxo75fd4bkmxxxkvje3zrm