signalapp/Signal-Server
Signal Server
Signal-Server is a distributed communication backend and end-to-end encrypted messaging server. It serves as a secure message relay that implements the Signal Protocol to manage identity keys and session states for private communications.
The system functions as a cross-platform messaging backend that coordinates the delivery and exchange of encrypted messages between clients. It is designed to route private data between users while ensuring the server cannot access the conversation content.
The infrastructure provides secure communication capabilities through a relay-based delivery model and asynchronous message queuing. It manages device authentication and coordinates the routing of encrypted payloads across different operating systems.
Features
- Cross-Platform Messaging Backends - Provides the centralized backend infrastructure required to support encrypted messaging across multiple platforms and operating systems.
- Session State Management - A server-side realization of the Signal Protocol for managing identity keys and session state for secure messaging.
- Blind Relays - Ensures the server cannot access conversation content while routing messages between users.
- Handshake Key Negotiations - Facilitates the exchange of public keys to establish secure sessions while keeping decryption keys on the devices.
- End-to-End Encrypted Messaging Frameworks - Provides the server-side infrastructure for an end-to-end encrypted messaging platform.
- End-to-End Encryption Protocols - Implements a server designed to coordinate encrypted message exchange using standards for forward secrecy and key exchange.
- Certificate-Based Authentication - Uses public key infrastructure and digital certificates to verify client identities before allowing message retrieval.
- Encrypted Message Routing - Acts as a blind intermediary that routes encrypted message blobs without accessing the plaintext content.
- Peer Communication Security - Provides the secure infrastructure and protocols for authenticated data exchange between distributed client nodes.
- Push Notification Services - Integrates with external push notification services to alert clients when new encrypted payloads are ready for download.
- Message Queuing Systems - Implements a buffering system that stores encrypted messages until the recipient device is available for retrieval.
- Stateless Request Processing - Processes client requests independently without server-side session state to enable horizontal scaling across distributed nodes.
- Communication Platforms - Server infrastructure for private messaging applications.
