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Nwobodo Ecclesiastes Chidera
Nwobodo Ecclesiastes Chidera

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I Built a Serverless, End-to-End Encrypted Messaging App That Works Without the Internet

#android #privacy #security #mobile

What if you could send private messages without WhatsApp, Telegram, internet access, user accounts, or centralized messaging servers?

Meet Eccles Bluechat E2EE — an experimental Android messaging application built around decentralized, Bluetooth-based communication.

Designed with privacy and independence at its core, Eccles Bluechat explores:

  • 🔐 End-to-end encryption using ECDH, HKDF-SHA256, and AES-256-GCM.
  • 🔑 Android Keystore-backed cryptographic key protection.
  • 📡 Serverless, internet-independent Bluetooth messaging.
  • 🛡️ Trust-on-first-use (TOFU) identity verification.
  • 📁 Encrypted local message and media storage.
  • 📞 Bluetooth-based voice and video communication.

No accounts. No advertisements. No tracking. No centralized messaging infrastructure.

This project explores an important engineering question: Can we build meaningful private communication systems without depending on the internet or centralized infrastructure?

This is an open-source engineering experiment, and I'm sharing the architecture, implementation, challenges, and lessons learned.

GitHub: https://github.com/Igwe-Starking/eccles-bluechat-e2ee

Built by Eccles (Igwe Starking).

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