CypherGuard

CypherGuard is a browser-based client-side encryption and decryption tool using AES-GCM with keys derived from passphrases via PBKDF2. It allows users to securely encrypt messages, decrypt them, and optionally generate or scan QR codes for encrypted payloads.

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Features

• AES-GCM 256-bit encryption for secure message confidentiality.
• PBKDF2 key derivation with 100,000 iterations for robust passphrase security.
• Encrypt and Decrypt messages entirely in the browser – no server-side processing.
• Copy results to clipboard with one click.
• Clear input and output easily.
• QR Code support:
  • Generate a QR code for the encrypted message.
  • Download the QR code as a PNG.
  • Upload and scan a QR code to retrieve encrypted content.
• Fully client-side, works offline after page load.
• Accessible design with aria attributes for screen readers.

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Demo

⚠️ Always use HTTPS when using encryption tools in production for security.

Click Me!

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Usage

1. Enter a message in the Message field.
2. Enter a passphrase (minimum 6 characters) in the Passphrase field.
3. Click Encrypt to generate the encrypted Base64 payload.
4. Click Decrypt to decrypt a Base64 payload back to plaintext.
5. Optional:
   • Click Copy to copy the result to the clipboard.
   • Click Clear to reset the fields.
   • Click QR to generate a QR code from the result.
   • Click Download QR to save the QR code as an image.
   • Click Upload QR to load an encrypted payload from a QR code image.

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Installation

Clone or download the repository:

git clone https://github.com/malindidev/cypherguard.git
cd cypherguard