Privacy and Security Threat Analysis for Private Messaging
draft-symeonidis-pearg-private-messaging-threats-00

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Network Working Group                                      I. Symeonidis
Internet-Draft                                  University of Luxembourg
Intended status: Standards Track                            B. Hoeneisen
Expires: May 3, 2020                                             Ucom.ch
                                                        October 31, 2019

       Privacy and Security Threat Analysis for Private Messaging
          draft-symeonidis-pearg-private-messaging-threats-00

Abstract

   Modern email and instant messaging applications offer private
   communications between users.  As IM and Email network designs become
   more similar, both share common concerns about security and privacy
   of the information exchanged.  However, the solutions available to
   mitigate these threats and to comply with the requirements may
   differ.  The two communication methods are, in fact, built on
   differing assumptions and technologies.  Assuming a scenario of
   untrusted servers, we analyze threats against message delivery and
   storage, the requirements that these systems need, and the solutions
   that exist in order to help implement secure and private messaging.
   From the discussed technological challenges and requirements, we aim
   to derive an open standard for private messaging.

Status of This Memo

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   This Internet-Draft will expire on May 3, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Symeonidis & Hoeneisen     Expires May 3, 2020                  [Page 1]
Internet-Draft     Private Messaging: Threat Analysis       October 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     1.2.  Terms . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  System Model  . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Entities  . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Assets and Functional Requirements  . . . . . . . . . . .   5
   3.  Threat Analyses and Requirements  . . . . . . . . . . . . . .   5
     3.1.  Adversarial Model . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Assumptions . . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Security Threats and Requirements . . . . . . . . . . . .   6
       3.3.1.  Spoofing and Entity Authentication  . . . . . . . . .   6
       3.3.2.  Information Disclosure and Confidentiality  . . . . .   7
       3.3.3.  Tampering With Data and Data Authentication . . . . .   7
       3.3.4.  Repudiation and Accountability (Non-Repudiation)  . .   7
       3.3.5.  Elevation of Privilege and Authorization  . . . . . .   8
     3.4.  Privacy Threats and Requirements  . . . . . . . . . . . .   8
       3.4.1.  Identifiability - Anonymity . . . . . . . . . . . . .   8
       3.4.2.  Linkability - Unlinkability . . . . . . . . . . . . .   8
       3.4.3.  Detectability and Observability - Undetectability . .   9
     3.5.  Information Disclosure - Confidentiality  . . . . . . . .   9
     3.6.  Non-repudiation and Deniability . . . . . . . . . . . . .   9
       3.6.1.  Policy Non-compliance and Policy compliance . . . . .  10
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  10
   6.  Future Key Challenges . . . . . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
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