How to Encrypt Assets in Android Apps

Last updated May 7, 2024 by Appdome

Learn to Encrypt Assets in Android apps, in mobile CI/CD with a Data-Driven DevSecOps™ build system.

What are Mobile Application Assets?

Mobile application assets provide a way to enhance the functionality and visual appearance of your mobile application. These assets are essential components of mobile app development and can include a variety of elements:

Images and Graphics: These are visual files like icons, logos, and background images that help define the look of the app. They can be static or dynamic, depending on the functionality and design requirements.

Audio and Video Files: Media files that provide auditory and visual content. These might include background music, sound effects, instructional videos, or promotional media.

Fonts and Text Files: Custom fonts can be included to maintain brand consistency and enhance aesthetics. Text files, often in the form of XML or JSON, can also be used for localization, allowing the app to support multiple languages.

Animations: Assets for animations might include sprite sheets or data files that describe animation sequences. These are used to create engaging and dynamic user interfaces.

Data Files: These might include configuration files, databases, or JSON/XML files that the app uses to store information locally or to configure its behavior.

UI Elements: This can include buttons, sliders, and other interactive components that make up the user interface.

These files, which are necessary for the app’s functionality and performance, are stored on the device under the assets folder of the application and are used during runtime.

Why Should Developers Encrypt Application Assets in Android Apps?

Encrypting application assets in Android apps is crucial primarily for ensuring security and protecting intellectual property. Encryption helps safeguard sensitive data contained within assets, such as configuration files with API keys or proprietary algorithms, from unauthorized access and exploitation. Moreover, it prevents tampering, ensuring that assets cannot be easily modified. This is particularly vital for maintaining the functionality and security of an app, as tampered assets can lead to malfunctions or introduce security vulnerabilities. Overall, encryption serves as a critical measure in securing an app’s operational integrity and safeguarding user data.

Prerequisites for Using Encrypt Assets:

To use Appdome’s mobile app security build system to Encrypt Assets , you’ll need:

Encrypt Assets on Android apps using Appdome

On Appdome, follow these 3 simple steps to create self-defending Android Apps that Encrypt Assets without an SDK or gateway:

  1. Upload the Mobile App to Appdome.

    1. Upload an app to Appdome’s Mobile App Security Build System

    2. Upload Method: Appdome Console or DEV-API
    3. Android Formats: .apk or .aab
    4. Encrypt Assets Compatible With: Java, JS, C++, C#, Kotlin, Flutter, React Native, Unity, Xamarin, Cordova and other Android apps
  2. Build the feature: Encrypt Assets.

    1. Building Encrypt Assets by using Appdome’s DEV-API:

      1. Create and name the Fusion Set (security template) that will contain the Encrypt Assets feature as shown below:
      2. fusion set that contains Encrypt Assets

        Figure 1: Fusion Set that will contain the Encrypt Assets feature
        Note: Naming the Fusion Set to correspond to the protection(s) selected is for illustration purposes only (not required).

      3. Follow the steps in Sections 2.2.1-2.2.2 of this article, Building the Encrypt Assets feature via Appdome Console, to add the Encrypt Assets feature to this Fusion Set.

      4. Open the Fusion Set Detail Summary by clicking the “...” symbol on the far-right corner of the Fusion Set, as shown in Figure 1 above, and get the Fusion Set ID from the Fusion Set Detail Summary (as shown below): fusion Set Detail Summary image

        Figure 2: Fusion Set Detail Summary
        Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory).

      5. Follow the instructions below to use the Fusion Set ID inside any standard mobile DevOps or CI/CD toolkit like Bitrise, App Center, Jenkins, Travis, Team City, Cirlce CI or other system:
        1. Build an API for the app – for instructions, see the tasks under Appdome API Reference Guide
        2. Look for sample APIs in Appdome’s GitHub Repository
    2. Building the Encrypt Assets feature via Appdome Console

      To build the Encrypt Assets protection by using Appdome Console, follow the instructions below.

      1. Where: Inside the Appdome Console, go to Build > Security Tab > TOTALData™ Encryption section.
      2. When you select the Encrypt Assets you'll notice that your Fusion Set you created in step 2.1.1 now bears the icon of the protection category that contains Encrypt Assets

        Fusion Set applied Encrypt Assets

        Figure 4: Fusion Set that displays the newly added Encrypt Assets protection

      3. Click Build My App at the bottom of the Build Workflow (shown in Figure 3).
    Congratulations!  The Encrypt Assets protection is now added to the mobile app

Using Appdome, there are no development or coding prerequisites to build secured Android Apps by using Encrypt Assets. There is no SDK and no library to code or implement in the app and no gateway to deploy in your network. All protections are built into each app and the resulting app is self-defending and self-protecting.

Releasing and Publishing Mobile Apps with Encrypt Assets

After successfully securing your app by using Appdome, there are several available options to complete your project, depending on your app lifecycle or workflow. These include:

Related Articles:

How to Encrypt Resources in Android Apps

How to Encrypt Strings.xml in Android Apps

How to Encrypt Java Class Files (.dex) in Android Apps

If you have any questions, please send them our way at or via the chat window on the Appdome platform.

Thank you!

Thanks for visiting Appdome! Our mission is to secure every app on the planet by making mobile app security easy. We hope we’re living up to the mission with your project.

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