Info Obfuscated methods


Obfuscation refers to methods to obscure code and make it hard to understand. Compiled Java classes can be decompiled if there is no obfuscation during compilation step.

Adversaries can steal code and repurpose it and sell it in a new application or create a malicious fake application based on the initial one.

Code obfuscation only slows the attacker from reverse engineering but does not make it impossible.


Design the application to add the following protections and slow reverse engineering of the application:

  • Obfuscate Java source code with tools like Proguard or Dexguard
  • buildTypes {
            release {
                minifyEnabled true
                proguardFiles getDefaultProguardFile('proguard-android.txt'),
  • Verification application signing certificate during runtime by checking context.getPackageManager().signature
  • Check application installer to ensure it matches the Android Market by calling context.getPackageManager().getInstallerPackageName
  • Check running environment at runtime
  • private static String getSystemProperty(String name) throws Exception {
        Class systemPropertyClazz = Class.forName("android.os.SystemProperties");
        return (String) systemPropertyClazz.getMethod("get", new Class[] { String.class }).invoke(systemPropertyClazz, new Object[] { name });
    public static boolean checkEmulator() {
        try {
            boolean goldfish = getSystemProperty("ro.hardware").contains("goldfish");
            boolean qemu = getSystemProperty("ro.kernel.qemu").length() > 0;
            boolean sdk = getSystemProperty("ro.product.model").equals("sdk");
            if (qemu || goldfish || sdk) {
                return true;
        } catch (Exception e) {
        return false;
  • Check debug flag at runtime
  • context.getApplicationInfo().applicationInfo.flags & ApplicationInfo.FLAG_DEBUGGABLE;

Technical details
com.suke.widget False False False True
javax.mail False
at.grabner.circleprogress False
com.ypyproductions.abtractclass False
javax.activation False
com.squareup.picasso False
myjava.awt.datatransfer False False
com.ypyproductions.webservice False
butterknife False False
javax.inject False
dagger False
com.bumptech.glide False
com.fastaccess.permission False False
com.kyleduo.switchbutton False
com.ypyproductions.task False False False
org.joda.time False
com.example.tutoshowcase False
hugo.weaving False
com.rudraum.rudraumThumb2Thief True
okio False
org.jsoup False
com.ypyproductions.utils False
com.nononsenseapps.filepicker False False
com.jaeger.library False
com.scottyab.aescrypt False False
android.arch.lifecycle False
com.amnix.materiallockview False False
pub.devrel.easypermissions False False False True False False