Signal and Messaging Layer Security

A book written by Rolf Oppliger and published in 2025 by Artech House in the Information Security and Privacy Series

ISBN: 978-1-68569-061-8

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Aims and Scope

This book provides a comprehensive introduction, detailed overview, and discussion of the Signal and Messaging Layer Security (MLS) protocols that enable end-to-end encrypted (E2EE) messaging on the Internet.

Target Audience

The book is intended for anyone who has a basic understanding of asynchronous and synchronous messaging on the Internet, and who wants to learn more about the Signal and MLS protocols and their proper use. It speaks to theorists and practitioners.

Table of Contents

Preface
Acknowledgments
Chapter 1: Introduction
Chapter 2: Cryptographic Toolbox
Chapter 3: Evolution
Chapter 4: Signal Protocol
Chapter 5: Group Communication
Chapter 6: MLS Protocol
Chapter 7: Further Developments and Improvements
Chapter 8: Conclusions and Outlook
Appendix A: ECC
Appendix B: Quantum Computers and PQC
Appendix C: Mathematical Notation
Appendix D: Abbreviations and Acronyms
About the Author
Index

Reviews

News

According to the latest release of the GSMA Communication Suite – End-to-End Encryption Specification Version 1.0, RCS now also supports MLS.

Additional Material

Errata List