1. Get ready for your environment, including:

   • An Android device that does not have a separate security chip like Google Pixel 4 and runs Android 11 or below.
   • Extract the shared preference from the device.
   • Enable developer mode in Android's setting.
   • ADB.
   • Java 8 (The GitHub workflow uses Temurin).

2. Clone this repo:

git clone https://github.com/KnugiHK/ExtractSignalKey
cd ExtractSignalKey

3. Paste the ENCRYPTED_SECRET found in shared_pref to MainActivity.java.

private static final String ENCRYPTED_SECRET = "";

4. Build the app using gradle:

chmod +x gradlew && ./gradlew build

For details see my blog post.