How to Hide MetaData in MLS-Like Secure Group Messaging: Simple, Modular, and Post-Quantum

ePrint Report: How to Hide MetaData in MLS-Like Secure Group Messaging: Simple, Modular, and Post-Quantum

Keitaro Hashimoto, Shuichi Katsumata, Thomas Prest

Secure group messaging (SGM) protocols allow large groups of users to communicate in a secure and asynchronous manner. In recent years, continuous group key agreements (CGKAs) have provided a powerful abstraction to reason on the security properties we expect from SGM protocols. While robust techniques have been developed to protect the contents of conversations in this context, it is …

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