On the Generation of Transient Numeric Identifiers
draft-gont-numeric-ids-generation-04

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Network Working Group                                            F. Gont
Internet-Draft                                              SI6 Networks
Intended status: Best Current Practice                           I. Arce
Expires: January 9, 2020                                       Quarkslab
                                                            July 8, 2019

           On the Generation of Transient Numeric Identifiers
                  draft-gont-numeric-ids-generation-04

Abstract

   This document performs an analysis of the security and privacy
   implications of different types of "numeric identifiers" used in IETF
   protocols, and tries to categorize them based on their
   interoperability requirements and the associated failure severity
   when such requirements are not met.  Subsequently, it provides advice
   on possible algorithms that could be employed to satisfy the
   interoperability requirements of each identifier type, while
   minimizing the security and privacy implications, thus providing
   guidance to protocol designers and protocol implementers.  Finally,
   this describes a number of algorithms that have been employed in real
   implementations to generate transient numeric identifiers and
   analyzes their security and privacy properties.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 9, 2020.

Copyright Notice

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

Gont & Arce              Expires January 9, 2020                [Page 1]
Internet-Draft     Generation of Transient Numeric IDs         July 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
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   This document may not be modified, and derivative works of it may not
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Threat Model  . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Issues with the Specification of Identifiers  . . . . . . . .   5
   5.  Protocol Failure Severity . . . . . . . . . . . . . . . . . .   6
   6.  Categorizing Identifiers  . . . . . . . . . . . . . . . . . .   6
   7.  Common Algorithms for Identifier Generation . . . . . . . . .   9
     7.1.  Category #1: Uniqueness (soft failure)  . . . . . . . . .   9
     7.2.  Category #2: Uniqueness (hard failure)  . . . . . . . . .  10
     7.3.  Category #3: Uniqueness, constant within context (soft-
           failure)  . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.4.  Category #4: Uniqueness, monotonically increasing within
           context (hard failure)  . . . . . . . . . . . . . . . . .  12
   8.  Common Vulnerabilities Associated with Transient Numeric
       Identifiers . . . . . . . . . . . . . . . . . . . . . . . . .  17
     8.1.  Network Activity Correlation  . . . . . . . . . . . . . .  17
     8.2.  Information Leakage . . . . . . . . . . . . . . . . . . .  17
     8.3.  Exploitation of Semantics of Transient Numeric
           Identifiers . . . . . . . . . . . . . . . . . . . . . . .  19
     8.4.  Exploitation of Collisions of Transient Numeric
           Identifiers . . . . . . . . . . . . . . . . . . . . . . .  19
   9.  Vulnerability Analysis of Specific Transient Numeric
       Identifiers Categories  . . . . . . . . . . . . . . . . . . .  19
     9.1.  Category #1: Uniqueness (soft failure)  . . . . . . . . .  19
     9.2.  Category #2: Uniqueness (hard failure)  . . . . . . . . .  20
     9.3.  Category #3: Uniqueness, constant within context (soft
           failure)  . . . . . . . . . . . . . . . . . . . . . . . .  20
     9.4.  Category #4: Uniqueness, monotonically increasing within