blue_ghost - encrypted chat

blue_ghost— Offline Encrypted Bluetooth Messenger

blue_ghost is an ad-free peer-to-peer encrypted messaging app that works entirely over Bluetooth. No internet connection, no servers, no accounts, no phone numbers, and no cloud storage.

Communicate privately with nearby devices using end-to-end encryption while remaining completely offline.

KEY FEATURES

• Offline messaging over Bluetooth
• End-to-end encrypted chat
• No internet required
• No servers or cloud infrastructure
• No account creation or registration
• No phone number required
• No ads or tracking
• Nearby device discovery
• Secure peer-to-peer communication
• Privacy-focused design
• Reconnect support for dropped Bluetooth sessions
• Typing indicators
• Adjustable interface scaling
• Hide timestamps
• Redaction Mode for concealed messages
• Mini games including dice rolls, coin flips, and rock-paper-scissors, ghost_tiles


SECURITY

blue_ghost is designed with a security-first architecture to minimize attack surface and maximize privacy.

• Double Ratchet encryption protocol
• ECDH key exchange
• Android Keystore hardware-backed identity protection
• ChaCha20-Poly1305 and AES-256-GCM encryption
• Forward secrecy and break-in recovery
• Replay attack protection
• Authenticated sequence numbers
• Hardware-assisted entropy collection
• Screen capture protection via FLAG_SECURE
• Root detection warnings

PRIVACY

Your conversations remain on your devices.

• No accounts
• No sign-up process
• No phone numbers
• No analytics
• No advertising networks
• No cloud backups
• No internet permission
• No remote servers

Session Seal technology allows both participants to cryptographically destroy session keys and message history simultaneously.

Privacy Mode hides message contents until intentionally revealed, helping protect conversations from shoulder surfing and accidental exposure.

WHY BLUETOOTH ONLY?

blue_ghost+ intentionally avoids Wi-Fi and internet connectivity to reduce metadata exposure and eliminate dependence on third-party infrastructure. Communication occurs directly between nearby devices without routing through external servers.

Designed for users who value privacy, local communication, digital minimalism, and secure offline messaging.

No cloud.
No metadata.
No compromise.