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SOAP is simply an XML message format that can be used to pass data between systems. It's not within the scope of SOAP to implement security. That being said, it's quite easy to secure SOAP messages. You can encrypt the SOAP messages to ensure data integrity and data privacy. You can sign the messages with a digitial signature for authentication and proof of origin. You can require that one or both of the participants in a SOAP message exchange authenticate themselves. You can intercept a SOAP message before it's passed to an application to check for proper authorization. This documentation provides an overview of how you might implement security using SOAP: http://www.systinet.com/products/wasp_advanced/doc/security_overview.html
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