🔐 Cryptography Interactive Tools

An interactive web application for exploring various cryptographic operations with an intuitive user interface.

Screenshots

Features

This project contains:

• Interactive Web UI with a modern, responsive design
• Hash Functions: SHA-256 hashing and salted password hashing
• HMAC: Hash-based Message Authentication Code
• Symmetric Encryption: AES-256 encryption and decryption
• Asymmetric Encryption: RSA encryption and decryption
• Quantum-Resistant Encryption: Crystals-Kyber (ML-KEM-768) post-quantum encryption
• Digital Signatures: RSA-SHA256 message signing and verification
• User Authentication: Signup and login with salted password hashing
• Chain Operations: Apply multiple cryptographic operations in sequence
• HTTP Server for serving the web application and API endpoints

Getting Started

1. Clone the repository
2. Install dependencies: npm install
3. Start the server: npm start
4. Open your browser to http://localhost:3000

For detailed Crystals-Kyber usage examples, see examples/kyber-usage.md.

Usage

Web Interface

The application provides an intuitive web interface where you can:

1. Enter a message in the input textarea
2. Click any cryptography button to apply operations
3. View results in the results section with proper formatting
4. Chain operations using the preset chain buttons for complex workflows
5. Copy results to clipboard for further use

Available Operations

• SHA-256 Hash: Generate a secure hash of your input
• Salted Hash: Create a salted hash for password storage
• HMAC: Generate Hash-based Message Authentication Code
• AES-256 Encryption/Decryption: Symmetric encryption with automatic key generation
• RSA Encryption/Decryption: Asymmetric encryption using generated key pairs
• Crystals-Kyber Encryption/Decryption: Post-quantum secure encryption using ML-KEM-768
• Digital Signatures: Sign messages and verify signatures
• User Authentication: Demonstrate secure signup/login flows

Chain Operations

Combine multiple cryptographic operations:

• Hash → HMAC → Encrypt → Sign: Full security pipeline
• Hash → Symmetric Encrypt: Hash then encrypt the result
• Sign → Asymmetric Encrypt: Sign message then encrypt the signature

API Endpoints

The application provides REST API endpoints for programmatic access:

• POST /api/hash - SHA-256 hashing
• POST /api/saltedHash - Generate salted hash
• POST /api/hmac - Generate HMAC
• POST /api/symmetricEncrypt - AES-256 encryption
• POST /api/symmetricDecrypt - AES-256 decryption
• POST /api/asymmetricEncrypt - RSA encryption
• POST /api/asymmetricDecrypt - RSA decryption
• POST /api/kyberGenerateKeys - Generate Crystals-Kyber key pair
• POST /api/kyberEncrypt - Quantum-resistant encryption
• POST /api/kyberDecrypt - Quantum-resistant decryption
• POST /api/kyberInfo - Get information about current Kyber keys
• POST /api/sign - Digital signature
• POST /api/verify - Signature verification
• POST /api/signup - User registration
• POST /api/login - User authentication

Quantum-Resistant Encryption

This project now includes Crystals-Kyber (ML-KEM-768), a quantum-resistant encryption algorithm that is part of NIST's Post-Quantum Cryptography standardization (FIPS 203).

Why Quantum-Resistant Cryptography?

Traditional encryption methods like RSA and ECC are vulnerable to attacks from quantum computers. Crystals-Kyber provides:

• Post-Quantum Security: Resistant to attacks from both classical and quantum computers
• NIST Standardized: Part of the NIST Post-Quantum Cryptography standard (ML-KEM)
• High Performance: Fast key generation, encryption, and decryption
• Security Level 3: Equivalent to AES-192 security

Usage Example

// Generate Kyber key pair
const keys = await generateKyberKeyPair();

// Encrypt a message
const encrypted = await kyberEncrypt("Secret message");
// Returns: { encrypted, ciphertext, iv }

// Decrypt the message
const decrypted = await kyberDecrypt(encrypted.encrypted, encrypted.ciphertext, encrypted.iv);
// Returns: "Secret message"

Technical Details

• Backend: Node.js with built-in crypto module and crystals-kyber-js
• Quantum Encryption: ML-KEM-768 (Crystals-Kyber) via crystals-kyber-js library
• Frontend: Vanilla HTML5, CSS3, and JavaScript
• UI Design: Modern gradient design with responsive layout
• Security: Uses Node.js crypto best practices
• Error Handling: Comprehensive error handling for all operations