Calculator Vault Privacy Policy
Uncompromising 100% offline privacy vault disguised as a fully functional arithmetic calculator. Disguise on the home screen, AES-256 encryption underneath.
Effective Date: October 2026 · Mumline Independent Studio
01Zero Internet Permission Architecture
Calculator Vault is a steganographic privacy utility for Android. To outside observers, it looks and acts as an authentic arithmetic calculator. Entering your secret passcode opens an encrypted storage vault. It operates with zero internet permissions.
02Absolute Inability to Transmit Data
Because Calculator Vault does not request nor possess Android network permissions, the operating system kernel physically prohibits the app from opening network sockets, making HTTP/HTTPS requests, or sending telemetry. Your vault files cannot physically escape your hardware.
03Hardware-Backed Encryption
All items placed inside the vault — photos, videos, notes, audio, and documents — are encrypted on-device with AES-256 in CBC mode with PKCS7 padding. Keys are derived using PBKDF2 with HMAC-SHA256 and salted. Without your secret PIN, raw vault bytes stored on disk are indecipherable noise.
04Sole Ownership and No Passcode Recovery
Because Mumline maintains zero servers and zero user telemetry, we cannot recover a lost passcode. Your secret PIN exists only in your memory and in on-device cryptographic verification. If you uninstall the application without unvaulting your files, the encrypted storage container is destroyed by the Android operating system.
