Development of AES-256 Based Secure Calling App for Android Phones

This paper presents the development and evaluation of a secure calling application for Android phones utilizing the AES-256 cryptographic algorithm. The application leverages the advanced capabilities of 5G networks to ensure secure audio, video calls, and messaging. This solution aims to provide commercial-grade secrecy for both military and civilian use, ensuring that all communications are encrypted end-to-end. Test results demonstrate the application's efficacy in maintaining communication integrity and security across various network conditions