![]() The app you’re working with is not doing certificate pinning in code.Your Android device is using the proxy (configured in the advanced settings for your WiFi connection), and the proxy can see TLS traffic through apps that will trust your CA by default (such as Chrome).Both of these tools will be discussed in more detail below. Applications that are developed with older versions of the Android SDK build tools prior to v24.0.3 will use the jarsigner app from the JDK. Your Android device has the CA certificate that the proxy is using installed on the device as a user CA (search settings for Certificates). Sign the APK This step involves using the apksigner utility from the Android SDK and signing the APK with the private key that was created in the previous step.You can then verify that the certificate fingerprint matches what is written on the site. APK files are just ZIP files in reality, so open it up with whatever archive tool you want (I use 7zip) and extract META-INFCERT.RSA from it. You have the TLS intercept proxy of your choice up and running (such as Burp Suite). You can verify the signing certificate on the APK matches this SHA256 fingerprint.This article describes how to modify an app to make it trust user CA certificates. ![]() Apps can choose to trust only the system certificates, and apps that target API level 24 and higher do this by default. However, Android distinguishes between certificates installed by the user and certificates that came with the operating system. To enable yourself as a man-in-the-middle for your own device, you can install custom certificate authorities (CAs) and configure the device to use an HTTP proxy just as you would a browser. These days, this traffic is TLS encrypted. In the next window, you will be shown the module (your application. Check the APK radio button and proceed to the next window. This opens up a screen where you have to select between creating an Android App Bundle and creating an APK file. When testing Android apps, one often wants to gain visibility into HTTP requests that the app makes in order to test the back-end services for security vulnerabilities. To generate a signed APK file, open the Build menu from the toolbar and select Generate Signed Bundle/APK.
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