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With services technology being on the rise, the needs for trustworthy and secure data processing emerge. Usually, trust can be established for a data originator and an ultimate data recipient, but how about the data-forwarding parties in between? Especially in inter-organizational service compositions it may be doubted whether all involved partners share the same level of security, especially for data they do not generate nor process themselves. In this paper, we focus on the data confidentiality problem in inter-organizational service compositions, propose a solution based on the Web Services and BPEL specifications, and show how this solution can be applied to real-world scenarios.