The integrity of data being transferred to the enduser within generic web applications is often implemented via digests of field values. For example, a hidden field may be sent within an HTML page to the enduser. To ensure this field value is not altered, you can attach a digest, which is checked when the data is sent back to the web application. SSL/ TLS is also an integrity mechanism to ensure data is not being manipulated in transit for web applications; however, as just discussed in the confidentiality recommendation, SSL/TLS is not a sufficient security control for web services.
XML Digital Signatures (http://www.w3.org/Signature/), OASIS Digital Signature Services (DSS) (http://www.oasis-open.org/committees/dss/), and again, WS-Security, implement digital signatures and security enhancements to SOAP that can be used to ensure data integrity within web services.
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