Web services are a new technology that gained much attention from service providers that provide web-based applications. Web services are so popular, because they are, as XML (extensible Markup Language) based services, very flexible, easy to deploy, fast to process and can be used for automated process as well as for user-oriented systems. The discussion on the deployment of web services is always connected to the security of this technology. For mobile web services this problem becomes even more imminent, since mobile clients do not have the security capabilities of a PC-based web service client. The threats to mobile web services and deployment of possible protection technologies will be discussed. The concept of a security gateway will be introduced in the context of a mobile web service security concept. This security gateway shall offer security support for mobile clients.
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