Crude POC for repeating random numbers in Android. Let it run till the PID wraps a few times (pid_max is 32768, set to 1000 for faster turnaround), then find duplicates with something like this: select pid,rand,count(*) from rand group by pid,rand having count(*) > 1 order by count(*) desc;

gistfile1.java

public class MainActivity {
  
  private static final String TAG = MainActivity.class.getSimpleName();
  
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
  }
  
  @Override
  public void onResume() {
    super.onResume();
    generateRandom();
  }

  private void generateRandom() {
        SecureRandom sr = new SecureRandom();
        int pid = android.os.Process.myPid();
        Log.d(TAG, "PID: " + pid);
        Log.d(TAG, "SecureRandom: " + sr.getClass().getName());
        Log.d(TAG, "SecureRandom provider: " + sr.getProvider().getName());
        byte[] bytes = new byte[8];
        sr.nextBytes(bytes);
        String rand = Crypto.toHex(bytes);
        Log.d(TAG, "Got: " + rand);

        SQLiteOpenHelper db = new SQLiteOpenHelper(this, "rand.db", null, 1) {

            @Override
            public void onCreate(SQLiteDatabase db) {
                String createTable = "create table rand(_id integer primary key autoincrement, pid integer not null, rand text not null)";
                db.execSQL(createTable);
            }

            @Override
            public void onUpgrade(SQLiteDatabase db, int oldVersion,
                    int newVersion) {
            }
        };

        ContentValues values = new ContentValues();
        values.put("pid", pid);
        values.put("rand", rand);
        db.getWritableDatabase().insert("rand", null, values);
        db.close();

        startActivity(new Intent(this, MainActivity.class));
        android.os.Process.killProcess(pid);
    }

}