Calculator Vault - Hide Photos

Project Overview

Calculator Vault is a secure, double-layered privacy locker app. To the user, it functions as a standard, fully operational mathematical calculator, but entering a pre-defined PIN triggers a transition into a locked file directory. The app provides robust local security and encryption layers to hide photos, videos, and private files.

Key Features & Objectives

• Masqueraded Interface: Fully working calculator UI acts as the decoy gate, hiding the secure entry screen.
• Media Security: Scans and hides chosen device photos/videos from default gallery directories and system index engines.
• Intrusion Monitoring: Logs invalid entry logs, taking silent snapshots of intruders (the intruder selfie feature).

Technical Stack & Technologies

• Languages: Kotlin
• Frameworks: Android Jetpack Suite, Android Cryptography APIs
• Database: Room Database (SQLite wrapper)
• Local Storage: Encrypted File Directories

Core Techniques & Encryption Protocols

• AES-256 File Encryption: Encrypts user files locally before writing them to isolated directories, blocking decryption even if files are accessed via direct root file explorers.
• Biometric Cryptographic Auth: Hooks into Android biometrics security modules to authorize folder decryption.
• Launcher Component Masking: Hides the application package activities from active processes logs to enforce privacy.

Links & References

• Download from Google Play: Calculator Vault on Google Play Store