Hermes от Omar Criacci

Hermes adds end-to-end encryption to any messaging platforms, including those that already have it, like WhatsApp, Telegram, and Facebook Messenger, using ECDH P-256 key exchange and AES-GCM encryption.

You create a master password that protects your encryption keys. To communicate securely with someone, you exchange public keys. Then you encrypt messages before sending and decrypt messages you receive.

Both you and your contact need the extension installed to communicate securely. Works with any text-based messaging platform.
All encryption happens locally on your device. Your keys never leave your browser.

Hermes features:
- ECDH P-256 key exchange
- AES-GCM 256-bit encryption
- Local storage with PBKDF2-protected vault (100k iterations)
- Profile management for contacts
- Clipboard integration
- No data collection or external servers
- Open source, vanilla JavaScript. No external libraries/dependencies