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IAST vs. DAST: 5 Key Differences, Pros/Cons & How to Choose

What Is DAST?

Dynamic application security testing (DAST) is a method for evaluating the security of web applications. It works by simulating external attacks to identify vulnerabilities in a running application.

This is part of an extensive series of guides about Security Testing.

DAST is deployed against live applications, often not requiring access to source code. By interacting with the application similarly to potential threats, it discovers security flaws that could be exploited by attackers.

DAST tools automate the scanning process, providing detailed reports of discovered vulnerabilities. This methodology mimics real-world attack vectors and identifies security weaknesses that could be missed during code reviews. However, it is limited to testing only exposed interfaces and cannot access or analyze source code for deeper issues.

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