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Anonymous Asynchronous Ratchet Tree Protocol for Group Messaging.

Kaiming Chen1, Jiageng Chen1, Jixin Zhang1

  • 1School of Computer, Central China Normal University, NO. 152 Luoyu Road, Wuhan 430079, China.

Sensors (Basel, Switzerland)
|February 9, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces the Anonymous Asynchronous Ratchet Tree (AART) for secure messaging. AART provides anonymity alongside forward secrecy and post-compromised security, enhancing user privacy in group communications.

Keywords:
anonymityend-to-end encryptionforward secrecygroup messaging protocolpost-compromised security

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Area of Science:

  • Cryptography and Network Security
  • Information Privacy

Background:

  • The double ratchet protocol, used in applications like Signal and WhatsApp, provides end-to-end encryption.
  • Asynchronous Ratchet Tree (ART) extended this to group communication, offering Forward Secrecy (FS) and Post-Compromised Security (PCS).
  • Existing ART protocols lack user identity privacy protection.

Purpose of the Study:

  • To formalize Internal Group Anonymity (IGA) and External Group Anonymity (EGA).
  • To develop an Anonymous Asynchronous Ratchet Tree (AART) protocol.
  • To ensure AART preserves FS and PCS while providing anonymity.

Main Methods:

  • Formalization of Internal Group Anonymity (IGA) and External Group Anonymity (EGA) concepts.
  • Development of the Anonymous Asynchronous Ratchet Tree (AART) protocol based on IGA and EGA.
  • Mathematical proof demonstrating AART's adherence to IGA, EGA, FS, and PCS requirements.

Main Results:

  • The proposed AART protocol successfully integrates anonymity features.
  • AART maintains Forward Secrecy (FS) and Post-Compromised Security (PCS) guarantees.
  • The study provides a formal proof of AART's security and anonymity properties.

Conclusions:

  • AART effectively addresses the need for user identity privacy in group messaging.
  • The protocol offers a robust solution for anonymous, secure group communication.
  • Further discussion on AART's performance and practical considerations is presented.