signalapp/Signal-iOS

Features

• End-to-End Encrypted Messaging Frameworks - Provides a secure communication application that uses end-to-end encryption to protect messages, voice calls, and media across multiple mobile devices.
• Cryptographic Protocols - Implements cryptographic protocols for establishing secure, forward-secret communication channels using advanced key exchange and post-quantum resistant algorithms.
• Forward Secrecy Implementations - Ensures that past communications remain secure and unreadable even if a long-term encryption key is compromised in the future.
• Cryptographic Identity Verification - Confirms the authenticity of contacts by validating unique security keys to prevent impersonation and ensure that messages are delivered to the correct person.
• Key Exchange Protocols - Updates session keys for every individual message to ensure forward secrecy and break the link between compromised keys and past communications.
• Message Synchronization - Maintains consistent encrypted session states and message history across multiple linked devices for a single user.
• Asynchronous Key Exchange Protocols - Facilitates secure communication between parties who are not online simultaneously by storing and retrieving public keys from a central directory.
• Digital Signature Schemes - Validates digital signatures using elliptic curve keys to confirm the integrity and authenticity of data transmitted between parties in a messaging environment.
• Elliptic Curve Cryptography - Uses mathematical properties of elliptic curves to perform efficient key exchange and digital signature verification for secure identity authentication.
• Post-Quantum Cryptography - Protects sensitive digital conversations against future decryption threats by implementing advanced algorithms that remain secure even against powerful quantum computers.
• Post-Quantum Key Exchange - Integrates quantum-resistant algorithms into the key exchange process to protect encrypted data against future decryption by large-scale quantum computers.
• Session Synchronization - Maintains consistent security states across multiple linked devices by distributing encrypted key material through a secure, authenticated messaging channel.
• Communication Apps - Private messaging and calling application.
• Encrypted Persistence - Secures all stored message history and metadata on the device using high-performance symmetric encryption keys managed by the operating system.
• Encryption Key Management - Rotates encryption keys for every individual message to ensure that past or future communications remain secure even if a specific session key is compromised.

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