signalapp/Signal-Desktop

Features

• Encrypted Messaging Platforms - Ships a cross-platform desktop client for private, end-to-end encrypted messaging and voice calls.
• End-to-End Encrypted Messaging Frameworks - Provides end-to-end encrypted messaging to ensure that only intended recipients can access conversation content.
• End-to-End Encryption - Provides end-to-end encrypted messaging to ensure only intended recipients can access conversation content.
• Asynchronous Key Exchange Protocols - Implements asynchronous key exchange protocols to facilitate secure session establishment between parties who are not online simultaneously.
• Cryptographic Protocols - Implements the Signal Protocol for asynchronous, forward-secret, and end-to-end encrypted messaging.
• Post-Quantum Cryptography - Protects digital communications against future decryption threats using advanced post-quantum cryptographic security.
• End-to-End Encryption - Implements end-to-end encryption to ensure that only intended recipients can access message content and metadata.
• Ratchet Protocols - Implements symmetric-key and Diffie-Hellman ratchets to derive unique message keys for every transmission, ensuring forward secrecy.
• Key Derivation Protocols - Derives new keys for every message to ensure forward secrecy and prevent decryption of past or future communications.
• Multi-Device Synchronization - Links desktop and mobile accounts to maintain consistent conversation history and contact lists across devices.
• Post-Quantum Key Exchange - Implements post-quantum key encapsulation to protect communication channels against future decryption threats.
• Secure Multi-Device Synchronization - Coordinates encrypted state across multiple linked clients by securely distributing session keys and message history.
• Message Synchronization - Synchronizes desktop clients with mobile accounts to maintain consistent conversation history across platforms.
• Header Obfuscation - Protects message metadata by encrypting packet headers with rotating keys to prevent traffic analysis.
• Encrypted Persistence - Secures message archives and user state on the local disk using strong encryption.
• Digital Signature Schemes - Validates cryptographic signatures using elliptic curve mathematics to ensure message authenticity and integrity.
• Encryption Key Management - Rotates identity and one-time keys to maintain forward secrecy and secure message initiation.
• Hybrid Cryptographic Protocols - Integrates hybrid cryptographic ratchets combining classical and post-quantum algorithms for layered security.
• Account Linking - Enables secure linking of desktop clients to mobile accounts via QR code scanning for synchronized history.
• Identity & Key Management - Verifies correspondent identities via public key fingerprint comparison to prevent impersonation.
• Key Agreement Protocols - Bootstraps messaging sessions by deriving initial root keys from established key agreement protocols.
• Key Management Protocols - Publishes and retrieves prekey bundles to facilitate asynchronous session establishment.
• Local Data Storage - Secures local message archives and conversation history to prevent unauthorized access on the device.
• Session Lifecycle Management - Rotates and expires cryptographic sessions based on inactivity to maintain security and clean up stale device state.
• Communication Clients - Desktop client for secure, encrypted messaging.
• Communication Tools - Secure and private messaging application.
• Media and Communication - Companion desktop app for Signal.
• Collaboration Tools - Listed in the “Collaboration Tools” section of the Awesome Mac awesome list.
• Communication and Messaging - Native encrypted messaging client for secure communication.
• Erasure Coding Libraries - Utilizes erasure coding to ensure reliable message reconstruction over constrained or unreliable network connections.
• Encrypted Backups - Encrypts local message archives to prevent unauthorized access if the physical device is compromised.
• Message Authentication Systems - Applies ratcheted message authentication codes to verify the integrity and origin of key exchange payloads.
• Message Encryption - Coordinates encrypted message state across multiple devices and asynchronous environments to ensure consistent communication.
• Data Lifecycle Management - Manages message retention and storage efficiency through automated lifecycle policies for local records.
• Data Transmission Reliability - Splits large cryptographic messages into robust chunks using erasure codes to ensure successful delivery.
• Code Signing - Generates digital signatures using XEdDSA to ensure the authenticity and integrity of signed content.
• Cryptographic Signature Verification - Validates XEdDSA digital signatures to confirm message origin and integrity.
• Error Recovery Protocols - Handles decryption failures by requesting message re-transmission to ensure reliable delivery despite synchronization errors.
• Account Migration Protocols - Transfers user message history and account information between devices to ensure continuity during setup.
• Key Exchange Protocols - Exchanges large cryptographic keys in incremental chunks to ensure reliability over constrained networks.
• Verifiable Random Function Signatures - Produces verifiable random function outputs alongside digital signatures to provide unique, deterministic message authenticity.
• Signature Verification Tools - Confirms the validity of verifiable random function signatures to ensure message authenticity.

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