I can develop a robust security tool for enhancing APK file protection using advanced techniques. My approach includes custom obfuscation, AES/ChaCha20 encryption for secure payload storage, dynamic decryption and execution in memory, and robust anti-debugging, emulator detection, and anti-tampering measures. The tool will re-sign the APK with a custom key to ensure integrity and prevent signature mismatches. With extensive experience in mobile security, encryption methods, and obfuscation, I will deliver a solution that significantly raises the bar against reverse engineering and unauthorized access.