What verification method can enhance security in outbound messages?

The method that enhances security in outbound messages is 2-way TLS (Transport Layer Security) and client certificate validation. This approach provides a robust layer of security by ensuring that both the client (Salesforce) and the server (the receiving application) authenticate each other before establishing a secure connection.

In this process, each party presents a digital certificate that is verified against a trusted Certificate Authority (CA). This mutual authentication ensures that data is only exchanged between legitimate entities, significantly reducing the risk of man-in-the-middle attacks and data interception. By employing 2-way TLS, organizations can ensure that their outbound messages are sent securely to the intended recipient, maintaining both the confidentiality and integrity of the data.

While other methods, such as timestamp checking and user password authentication, can provide certain levels of security, they do not include the comprehensive authentication capabilities of mutual TLS. Timestamp checking may help prevent replay attacks but does not verify the identity of the systems involved. User password authentication is typically more relevant for user access control rather than securing outbound system communications. IP address blocking can mitigate some threats but lacks the necessary granularity and does not provide authentication guarantees. Therefore, 2-way TLS with client certificate validation stands out as the most effective method for enhancing the security of outbound messages