SLIM MLS Module

The agntcy-slim-mls module provides Messaging Layer Security (MLS) implementation for the Agntcy SLIM data plane, enabling secure group communication with end-to-end encryption and forward secrecy.

Overview

The MLS module implements the IETF Messaging Layer Security protocol to provide:

• End-to-end encryption for group communications
• Forward secrecy through continuous key rotation
• Post-compromise security via tree-based key derivation
• Dynamic group membership with secure member addition/removal
• Identity verification integrated with SLIM's authentication system

Features

Core Capabilities

• Group Management: Create, join, and manage secure communication groups
• Member Operations: Add and remove members with proper key distribution
• Message Encryption: Secure application messages with group keys
• Key Rotation: Automatic and manual key updates for forward secrecy
• Persistent Storage: Save and restore group state and identities

Security Properties

• Confidentiality: Messages are encrypted and only readable by group members
• Authentication: Message sender identity is cryptographically verified
• Integrity: Message tampering is detected and prevented
• Forward Secrecy: Past messages remain secure even if current keys are compromised
• Post-Compromise Security: Future messages are secure after key compromise recovery