With the growing reliance on smartphones to store personal photos and videos, the demand for mobile data protection has become increasingly urgent.This study proposes a mobile security architecture that integrates three layers of protection: encrypted media storage, anti-breaking password mechanisms, and intrusion alerts. The system employs robust encryption algorithms to secure multimedia files, applies hashed password authentication to resist brute-force attacks, and activates proactive alerts by capturing intruders’ photos and logging failed attempts. A prototype was developed using the Flutter framework to ensure cross-platform compatibility, and tested on real devices to validate usability and performance. Results demonstrate that the system effectively safeguards private photos and videos, offering both strong data confidentiality and active intrusion monitoring. The key contribution lies in advancing mobile privacy protection by combining encryption, authentication, and intelligent alert systems into a unified architecture.