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End-users face escalating difficulties in securely handling diverse digital assets, from account credentials to private documents. This paper examines ShieldVault 1.0, an integrated mobile ecosystem engineered to protect the full lifecycle of these distinct data types. By pairing a Node.js backend with a React Native client, the system universally applies AES-256-GCM authenticated encryption to secure passwords, plaintext notes, and complex binary files simultaneously. Furthermore, the application features an embedded entropy generator alongside a secure file-streaming module. Testing on common mobile hardware reveals encryption delays consistently falling below the 20-millisecond threshold, proving that comprehensive, multi-format encryption can be achieved without compromising mobile responsiveness.