On the Generation of Transient Numeric Identifiers
draft-irtf-pearg-numeric-ids-generation-07

Document Type Active Internet-Draft (pearg RG)
Authors Fernando Gont  , Ivan Arce 
Last updated 2021-02-09 (latest revision 2021-02-02)
Replaces draft-gont-predictable-protocol-ids, draft-gont-numeric-ids-generation
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Internet Research Task Force (IRTF)                              F. Gont
Internet-Draft                                              SI6 Networks
Intended status: Informational                                   I. Arce
Expires: August 6, 2021                                        Quarkslab
                                                        February 2, 2021

           On the Generation of Transient Numeric Identifiers
               draft-irtf-pearg-numeric-ids-generation-07

Abstract

   This document performs an analysis of the security and privacy
   implications of different types of "transient numeric identifiers"
   used in IETF protocols, and tries to categorize them based on their
   interoperability requirements and their 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 category, while
   minimizing the negative security and privacy implications, thus
   providing guidance to protocol designers and protocol implementers.
   Finally, it describes a number of algorithms that have been employed
   in real implementations to generate transient numeric identifiers,
   and analyzes their security and privacy properties.  This document is
   a product of the Privacy Enhancement and Assessment Research Group
   (PEARG) in the IRTF.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 August 6, 2021.

Gont & Arce              Expires August 6, 2021                 [Page 1]
Internet-Draft     Generation of Transient Numeric IDs     February 2021

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Threat Model  . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Issues with the Specification of Transient Numeric
       Identifiers . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Protocol Failure Severity . . . . . . . . . . . . . . . . . .   7
   6.  Categorizing Transient Numeric Identifiers  . . . . . . . . .   7
   7.  Common Algorithms for Transient Numeric Identifier Generation  10
     7.1.  Category #1: Uniqueness (soft failure)  . . . . . . . . .  10
     7.2.  Category #2: Uniqueness (hard failure)  . . . . . . . . .  13
     7.3.  Category #3: Uniqueness, stable within context (soft
           failure)  . . . . . . . . . . . . . . . . . . . . . . . .  13
     7.4.  Category #4: Uniqueness, monotonically increasing within
           context (hard failure)  . . . . . . . . . . . . . . . . .  15
   8.  Common Vulnerabilities Associated with Transient Numeric
       Identifiers . . . . . . . . . . . . . . . . . . . . . . . . .  21
     8.1.  Network Activity Correlation  . . . . . . . . . . . . . .  21
     8.2.  Information Leakage . . . . . . . . . . . . . . . . . . .  22
     8.3.  Fingerprinting  . . . . . . . . . . . . . . . . . . . . .  23
     8.4.  Exploitation of the Semantics of Transient Numeric
           Identifiers . . . . . . . . . . . . . . . . . . . . . . .  24
     8.5.  Exploitation of Collisions of Transient Numeric
           Identifiers . . . . . . . . . . . . . . . . . . . . . . .  24
     8.6.  Exploitation of Predictable Transient Numeric Identifiers
           for Injection Attacks . . . . . . . . . . . . . . . . . .  24
     8.7.  Cryptanalysis . . . . . . . . . . . . . . . . . . . . . .  25
   9.  Vulnerability Assessment of Transient Numeric Identifiers . .  26
     9.1.  Category #1: Uniqueness (soft failure)  . . . . . . . . .  26
     9.2.  Category #2: Uniqueness (hard failure)  . . . . . . . . .  26
     9.3.  Category #3: Uniqueness, stable within context (soft
           failure)  . . . . . . . . . . . . . . . . . . . . . . . .  27
     9.4.  Category #4: Uniqueness, monotonically increasing within
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