🛡️ AegisCrypt Web

Professional Client-Side Encryption Suite

AegisCrypt Web is a modern, high-performance encryption tool built with React and the Web Crypto API. It brings desktop-grade security (AES-256-GCM) to the browser, allowing users to encrypt and decrypt files and folders locally without data ever leaving their device.

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Features

• Zero-Knowledge Architecture: All encryption happens in your browser's memory. No files are ever uploaded to a server.
• Industry Standard Security:
  • Algorithm: AES-256-GCM (Galois/Counter Mode).
  • Key Derivation: PBKDF2 with HMAC-SHA256 (100,000 iterations).
  • Salt: 16-byte cryptographically strong random salt.
  • IV/Nonce: 12-byte random initialization vector per file.
• Modern UI/UX:
  • Drag & Drop support.
  • Recursive folder processing.
  • Real-time operation logging.
  • Dark mode interface designed with Tailwind CSS.
• Password Strength Meter: Real-time feedback on password complexity.

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Technical Specifications

AegisCrypt uses the browser's native window.crypto.subtle API for maximum performance and security.

Component	Specification	Description
Encryption	AES-GCM	256-bit key length, 128-bit authentication tag.
KDF	PBKDF2	Derives key from password. Uses SHA-256.
Iterations	100,000	Protects against brute-force attacks.
Salt	16 Bytes	Randomly generated per file.
IV	12 Bytes	Randomly generated per file to prevent pattern analysis.

Encrypted File Structure

The output .enc file follows this binary structure:

[ Salt (16 bytes) ] + [ IV (12 bytes) ] + [ Ciphertext + Auth Tag ]

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Installation & Usage

Prerequisites

• Node.js (v18 or higher)
• npm or yarn

1. Clone and Install

git clone https://github.com/Bangkah/AegisCrypt-Web.git
cd AegisCrypt-Web
npm install

2. Run Locally

npm start
# App will run at http://localhost:3000

3. Build for Production

npm run build

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Project Structure

src/
├── components/
│   ├── LogBox.tsx        # Terminal-style operation logger
│   └── PasswordInput.tsx # Secure input with strength meter
├── services/
│   └── cryptoService.ts  # Core Web Crypto API implementation
├── constants.ts          # Crypto constants (Iterations, Salt sizes)
├── types.ts              # TypeScript interfaces
├── App.tsx               # Main application controller
└── index.tsx             # Entry point

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Security Notice

While this application uses industry-standard algorithms:

1. Forgot Password: If you lose your password, your data is lost forever. There is no "reset" or "backdoor."
2. Browser Limitations: Since this runs in the browser, extremely large files (e.g., >2GB) may hit browser memory limits depending on your hardware.

Built With

• react