International Journal of Computer Applications
Several companies and individuals are increasingly dependent on the electronic means to provide and consume services. A single service may not fulfil the requirement of a service consumer and hence, composition of web services which together satisfy the requirements is essential. In service provisioning, security attacks such as message alteration attack may happen at the service level or at the composition level. It is required to ensure secure data flow without information leaking through covert channels. Most of the existing works on web services security provide solutions for ensuring only confidentiality, client authorization and integrity of information.