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Confidentiality and integrity are two critical components of web services. While confidentiality can be ensured by means of encryption, the encrypted data can still be overwritten and the integrity of the message can be compromised. It is equally important to protect the integrity of the message, and digital signatures can help protect the integrity of the message. In this article, I describe how to digitally sign and verify messages in web services using Oracle Web Services Manager, which is a component of Oracle's SOA Suite -- a web services security and monitoring product that helps organizations not only to define and enforce security policies, but also to define and enforce the service level agreements. And one of the key components of Service Oriented Architecture is security.