How can developers implement secure messaging systems to prevent message-based attacks

Question

I’m interested in best practices for building secure messaging systems that can resist message-based attacks, such as unauthorized access, message tampering, and impersonation. What approaches can be used to prevent these risks? I’m specifically looking for information on encryption practices, message validation, and user authentication.

Any recommended techniques or libraries for securing messaging systems, especially for applications dealing with sensitive information, would be appreciated.