StegnaVault Pro 🛡️

Advanced Browser-Based Steganography Suite via Images

StegnaVault Pro is a client-side web application that combines military-grade encryption (AES) with image steganography to hide files inside standard images. Unlike simple LSB tools, StegnaVault Pro uses a custom parity-based encoding algorithm spread across pixel blocks, ensuring data integrity and minimal visual distortion.

🚀 Features

1. FCrypt (File Encryption & Hiding)

The core module that encrypts files and embeds them into a "carrier" image.

• Full Privacy: Encrypts filenames, file types, and sizes. Even if the steganography is detected, the metadata remains hidden.
• Capacity Calculation: Automatically calculates max file size based on image resolution.

2. Decrypt (Extraction)

Retrieves hidden data from stego-images.

• Integrity Check: Uses a hidden "Verifier Token" to instantly reject incorrect passwords without generating corrupted files.
• Auto-Restoration: Restores the original filename and file type automatically upon successful decryption.

3. Stego-Checker

A diagnostic tool to analyze images.

• Header Detection: Scans for the proprietary <ICRYPT> signature.
• Privacy Safe: Confirms the presence of hidden data without revealing what it is (since headers are now encrypted).

4. Resizer (Capacity Expander)

Increases the storage capacity of small images using specific algorithms.

• Nearest Neighbor: Upscales images without blurring, preserving sharp edges ideal for pixel manipulation.
• Scale: Supports up to 32x upscaling for massive storage potential.

5. Visualizer

A graphical representation of the hidden data structure.

• Shows the memory distribution (Header, Encrypted Payload, Free Space).

6. Comparator

A forensic tool to compare Original vs. Stego images.

• Slider View: Interactive swipe to see visual differences.
• Difference Map: Subtracts pixel values to highlight modified bits in red.

🧠 How It Works

Steganography Algorithm: The 3-Pixel Block Method

Instead of the standard Least Significant Bit (LSB) method which can be fragile, StegnaVault Pro uses a custom Parity Encoding Scheme distributed over 3-pixel blocks.

1. The Grid: The image is treated as a linear array of pixels.
2. The Block: We group every 3 pixels together.
   • 3 Pixels = 9 Color Channels (R, G, B x 3).
3. The Payload: Each block stores 1 Byte (8 bits) of data + 1 Parity Bit.
4. Encoding Logic:
   • The algorithm reads the bit (0 or 1).
   • It adjusts the channel value to be Even (for 0) or Odd (for 1).
   • Example: If we need to store a 1 (Odd) and the Red channel is 200 (Even), it changes to 201.
   • This creates a minimal change (+/- 1 value) invisible to the human eye.

Capacity Formula:

$$\text{Capacity (Bytes)} \approx \frac{\text{Width} \times \text{Height}}{3}$$

Security Architecture

StegnaVault Pro employs a "Wrap-then-Encrypt" strategy using CryptoJS (AES).

1. The Secure Object

Before encryption, the file is wrapped in a JSON structure:

{
  "verifier": "ICRYPT_OK",
  "meta": {
    "n": "secret_plans.pdf",
    "t": "application/pdf",
    "s": 10240
  },
  "data": "base64_encoded_string..."
}

2. The Payload Structure

The object above is stringified and AES-encrypted. It is then sandwiched between magic signatures: <ICRYPT> + [AES ENCRYPTED BLOB] + </ICRYPT>

3. The Verifier Token

When decrypting, the app first looks for the verifier key: "ICRYPT_OK".

• If Pass is Correct: The token is found, and the file is extracted.
• If Pass is Wrong: The decryption produces garbage, the token is missing, and the app throws an "Integrity Check Failed" error.

🛠️ Tools & Tech Stack

• Core: HTML5, JavaScript (ES6+).
• UI Framework: Tailwind CSS (via CDN).
• Cryptography: crypto-js (AES implementation).
• Icons: Lucide Icons.
• Font: JetBrains Mono (Google Fonts).

💡 Tips & Tricks

1. Image Formats:
   • Always save/share the output as PNG.
   • Never convert the output to JPG/JPEG. JPEG compression destroys the specific odd/even pixel values, corrupting the data.
2. Maximizing Capacity:
   • If your image is too small for your file, use the Resizer tab.
   • Select "Nearest Neighbor" for the cleanest upscale.
   • A 1920x1080 image can hold approx 690 KB.
   • Upscaling by 2x quadruples the capacity.
3. Password Safety:
   • Because the filename and type are inside the encrypted blob, if you lose the password, you lose the file type information too. You won't know if the hidden file was a PDF or an Image.

🔮 Future Directions

The following features are planned for future iterations of StegnaVault:

1. Incorporating JPEG Files: Developing DCT (Discrete Cosine Transform) modification algorithms to allow data hiding that survives JPEG compression.
2. Audio Steganography: Extending the parity encoding logic to WAV audio samples or MP3 frames to hide data in sound files.
3. Video Steganography: Hiding data across frames in video files, utilizing the vast storage capacity of video containers.

📦 Installation

StegnaVault Pro is a single-file application (stegnaVault_pro.html).

1. Download the .html file.
2. Open it in any modern web browser (Chrome, Firefox, Edge, Safari).
3. No server or internet connection is required (it runs entirely offline).

📦 Vrsion Control Detsils:

version Details.md

⚠️ Disclaimer

This tool is for educational and privacy-protection purposes. Users are responsible for complying with local laws regarding encryption and data hiding.