Static or Dynamic: which analysis really ensures mobile app security?

Mobile applications are the heart of many business operations, but their security is often underestimated or addressed partially. Understanding the difference between static and dynamic analysis is not just a technical matter: it’s essential for building a solid approach to securing apps and business data.

In this article, we will explore the two approaches, their strengths, and their limitations.

Static Analysis: starting from the ground up.

Static analysis examines the app’s source code or binary file without executing it. It is an essential tool in the early stages of a project, as it allows you to:

• Identify known vulnerabilities, such as the use of outdated libraries or incorrect configurations.
• Discover structural errors that could compromise the functionality or security of the app.

However, as mentioned, static analysis focuses solely on the code. It does not consider how the app will interact with the real environment, leaving critical aspects uncovered, such as the protection of transmitted data or the authentication of connections.

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Dynamic Analysis: the field test.

Dynamic analysis, on the other hand, observes the app’s behavior in a real environment. This technique is essential for discovering vulnerabilities that only emerge during the app’s usage. Penetration testers run the application, checking aspects such as:

• Unprotected connections or insecurely transmitted data.
• Invasive permissions or features that jeopardize user privacy.
• Abnormal behaviors under simulated specific conditions, such as man-in-the-middle attacks or interactions with insecure networks

Unlike static analysis, dynamic analysis adapts to the real environment but does not focus on the details of the code.

The key difference between Static and Dynamic Analysis.

An often overlooked aspect is that static and dynamic analyses are not alternatives, but complementary.

• Static analysis is perfect for detecting vulnerabilities in the code and ensuring a solid foundation during development.
• Dynamic analysis is crucial for simulating real-world scenarios and verifying the app’s security in operational situations.

The combination of both provides a complete view: the code is verified upstream, while field tests ensure that the app is secure in the real world.

Why is an integrated approach essential?

Mobile app threats evolve rapidly. Only an integrated approach between static and dynamic analysis provides complete protection.

• Risk reduction: every phase of the app is analyzed, from the source code to interactions with the environment.
• Continuous improvement: identify vulnerabilities before they become an operational issue.
• Compliance and reputation: protecting end users enhances trust in your brand.

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