What Is Message level Security in WCF?

Message security uses the WS-Security specification to secure messages. The specification describes enhancements to SOAP messaging to ensure confidentiality, integrity, and authentication at the SOAP message level (instead of the transport level).

In brief, message security differs from transport security by encapsulating the security credentials and claims with every message along with any message protection (signing or encryption). Applying the security directly to the message by modifying its content allows the secured message to be self-containing with respect to the security aspects. This enables some scenarios that are not possible when transport security is used.

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