Which approach is considered a black-box security testing method?

Dynamic application security testing (DAST) is considered a black-box security testing method because it assesses the application from an external perspective without access to the internal code or logic. This testing approach simulates how an attacker would interact with the application while trying to identify vulnerabilities, making it highly effective for uncovering issues that could be exploited in a real-world scenario.

In DAST, testers execute the application just like a user would, providing inputs and analyzing the outputs to identify security flaws, such as injection vulnerabilities or session management issues. By focusing on the application's behavior and response, DAST helps ensure that security measures are effective in a production environment.

The other methods listed—static application security testing (SAST), binary code inspection, and source code review—are not black-box approaches; they involve a deeper level of access to the code or binaries being tested. They analyze the internal workings of the application rather than observing its behavior from an external standpoint, which is fundamental to the distinction between black-box and white-box testing methodologies.