Two days ago, I helped my friends to solve CTF NahamCon2022 challenges. I was wondering about Android challenges, so I focused on them. In this blog post, I’ll explain how I solved Android challenges. Mobilize This one was an easy challenge for beginners. Anyone could solve this. :)) I opened the APK file in Jadx-GUI. There was nothing in MainActivity. So I just searched in strings.xml, and there it is. FLAG!