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
org.slf4j False
com.tosan.mobilebank False
net.monius False False
org.honorato.multistatetogglebutton False True
eu.davidea.viewholders False
com.afollestad.materialdialogs False
org.apache.http False False
brut.common False False False False
brut.util False False False
okhttp3 False
com.tosan.fingerprint False
eu.davidea.flexibleadapter False
com.flipboard.bottomsheet False False False
com.mindprod.ledatastream False
brut.androlib False False False False
retrofit2 False
org.spongycastle False
flipboard.bottomsheet False
okio False False
hugo.weaving False False
eu.davidea.fastscroller False False False False
com.scenus False
com.tosan.contacts False