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
kotlin False False False False
bolts False
com.facebook.fbcore False
com.ogaclejapan.arclayout False True
com.whiteelephant.monthpicker False False
com.dlazaro66.qrcodereaderview False
com.squareup.picasso False False
com.flaviofaria.kenburnsview False
com.iarcuschin.simpleratingbar False False
com.facebook.imagepipeline False
com.yalantis.filter False
com.facebook.datasource False
com.andexert.library False
org.jetbrains.annotations False True
com.nineoldandroids.animation False
com.scottyab.showhidepasswordedittext False False
org.androidannotations.api False False
com.nineoldandroids.util False
com.facebook.binaryresource False
me.leolin.shortcutbadger False False False
okhttp3 False
com.facebook.drawee False
com.QRCodeReaderView False
okio False False False
org.androidannotations.annotations False True
com.nineoldandroids.view False
retrofit2 False False
lecho.lib.hellocharts False
com.facebook.imageutils False
de.greenrobot.event False False
com.facebook.imageformat False