🛡️ Cryptix

State-of-the-Art Interactive Visual Encryption Suite

Cryptix is a high-performance, cryptographically secure tool designed to obfuscate visual data by encrypting the raw pixel matrices of images. Unlike simple filters or password-protected archives, Cryptix leverages the XChaCha20 stream cipher to transform images into mathematically randomized noise, rendering them completely unreadable without the unique decryption key.

Explore the Code • Installation • Usage

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✨ Key Features

• Military-Grade Encryption: Utilizes XChaCha20, a modern stream cipher known for its speed and security, providing a 256-bit key and a 192-bit nonce.
• Lossless Pixel Manipulation: Operates directly on the RGBA byte stream. By enforcing .png output, Cryptix ensures that not a single bit of encrypted data is lost to compression artifacts.
• Zero-Trace Memory: Implements the zeroize trait to securely wipe sensitive keys from RAM immediately after use, preventing cold-boot attacks.
• Sleek TUI Experience: A polished Terminal User Interface (TUI) featuring neon aesthetics, interactive prompts, and real-time progress tracking.
• Smart Key Management: Generates compact, URL-safe Base64 bundles that combine the key and nonce for easy portability.

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⚙️ Technical Architecture

The Encryption Pipeline

Cryptix does not encrypt the file container; it encrypts the visual data itself.

1. Decoding: The image is loaded into a raw RGBA8 buffer.
2. Keystream Generation: XChaCha20 generates a pseudo-random stream of bytes based on a 32-byte key and a 24-byte nonce.
3. XOR Splicing: The image buffer is XORed with the keystream. Because XOR is its own inverse, applying the same keystream a second time restores the original image.
4. Lossless Serialization: The resulting "noise" is saved as a PNG to ensure the encrypted bytes are preserved exactly as they are.

Security Specifications

Component	Specification	Detail
Cipher	XChaCha20	IETF variant for high-security stream encryption
Key Length	256-bit	Generated via OsRng (Cryptographically Secure PRNG)
Nonce	192-bit	Unique per image to prevent keystream reuse attacks
Memory	Zeroize	Guaranteed erasure of keys from memory upon Drop
Encoding	Base64 URL-Safe	No-pad encoding for maximum compatibility

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🚀 Installation

Prerequisites

Ensure you have the Rust toolchain installed on your system.

Build from Source

# Clone the repository
git clone https://github.com/yourusername/cryptix.git
cd cryptix

# Build in release mode for maximum performance
cargo build --release

The compiled binary will be located at `./target/release/cryptix`.

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## 🛠️ Usage

1. **Launch the Suite**:
   ```bash
   ./target/release/cryptix

2. Encrypting an Image:

   • Navigate to ◈ Target Image File.
   • Select your image from the scanned list.
   • Select 🔒 Encrypt (Lock Data).
   • CRITICAL: Copy the SECRET KEY block displayed in the terminal. If you lose this key, the image is mathematically unrecoverable.

3. Decrypting an Image:

   • Navigate to ◈ Target Image File.
   • Select the _locked.png image.
   • Select 🔓 Decrypt (Unlock Data).
   • Paste the secret key when prompted.

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⚠️ Critical Warnings

• Lossless Formats Only: Cryptix strictly requires .png for output. Using lossy formats like .jpg would alter the encrypted bytes, resulting in a corrupted image upon decryption.
• Key Permanence: There is no "Password Reset" or "Recovery" mode. The security of XChaCha20 ensures that without the key, the image is indistinguishable from random noise.

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🗺️ Roadmap

• Batch Processing: Encrypt/Decrypt entire directories.
• Key File Support: Save keys to encrypted .key files instead of terminal output.
• GUI Implementation: A modern desktop wrapper using Tauri or iced.
• Steganography: Hide encrypted data inside seemingly normal images.

📄 License

Distributed under the MIT License. See LICENSE for more information.

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Developed with 🦀 Rust for absolute security and performance.