1 min read MikroFilm

MikroFilm v0.4 beta

MikroFilm v0.4 beta

https://gitlab.com/NoBravado/mikrofilm

MikroFilm is an offline HTML application for AES-256 image encryption with steganographic text encoding. Runs entirely in your browser.

✨ Key Features

  • 🔒 AES-256-GCM authenticated encryption
  • 📝 Steganographic encoding (encrypted data as word sequences)
  • 🖼️ JPEG, PNG, GIF, WebP support
  • 📎 File picker, drag & drop, clipboard paste
  • 🔐 Optional EXIF/GPS metadata stripping
  • 💾 Zero dependencies (Web Crypto API only)
  • 🖥️ Desktop browsers only
  • 🌎 Locales for 7 languages: En,Fr,Es,It,Pt,Nl,De

📖 Usage

Encrypt

  1. Load image (drag & drop, paste, or browse)
  2. Choose to keep or strip metadata
  3. Enter password (20+ chars recommended)
  4. Copy encrypted text

Decrypt

  1. Paste encrypted text
  2. Enter password
  3. View or burn image

🔬 Technical Specifications

Cryptography

Component Specification
Encryption AES-256-GCM
Key Derivation PBKDF2-SHA256, 600,000 iterations
Salt 16 bytes
IV 12 bytes
Hash SHA-256

Steganography

  • Dictionary: 256 common English words
  • Encoding: Each byte → one word
  • Output: Word sequence (not grammatical)

Security Features

Core Security

  • ✅ Authenticated encryption (AES-GCM)
  • ✅ High-iteration key derivation (600k PBKDF2)
  • ✅ Cryptographically secure randomness
  • ✅ Integrity verification (SHA-256)
  • ✅ Input validation & sanitization

Operational Security

  • ⏱️ 10-minute inactivity timeout
  • 🔥 Burn function (complete data destruction)
  • 🧹 Automatic memory cleanup
  • 🚫 No cookies or localStorage
  • 🛡️ Comprehensive CSP headers

Privacy Features

  • 📸 Metadata stripping (removes EXIF/GPS)
  • 📝 Steganographic text encoding
  • ✔️ Magic bytes validation
  • 🌐 No telemetry or tracking
  • 📡 No network requests

🛡️ Security

Threat Model

Protects Against:

  • Passive interception
  • Content exposure
  • Metadata leakage (EXIF/GPS)
  • Basic forensics

Does NOT Protect Against:

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  • Keyloggers/screen capture
  • Physical access to device
  • Compromised browser/OS

Limitations

  • Browser-based crypto constraints
  • Maximum file size: 5MB
  • Maximum dimensions: 4000×4000 pixels
  • Large images produce very long texts

Nobra Vado

Self-taught operational security researcher building accessible privacy tools for everyone. Creating infrastructure against global surveillance while rejecting technical gatekeeping - privacy protection should be a right, not a privilege.