The Impact of Transport Header Confidentiality on Network Operation and Evolution of the Internet
draft-ietf-tsvwg-transport-encrypt-08

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Last updated 2019-08-26
Replaces draft-fairhurst-tsvwg-transport-encrypt
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TSVWG                                                       G. Fairhurst
Internet-Draft                                    University of Aberdeen
Intended status: Informational                                C. Perkins
Expires: February 24, 2020                         University of Glasgow
                                                         August 23, 2019

The Impact of Transport Header Confidentiality on Network Operation and
                       Evolution of the Internet
                 draft-ietf-tsvwg-transport-encrypt-08

Abstract

   This document describes some implications of applying end-to-end
   encryption at the transport layer.  It first identifies in-network
   uses of transport layer header information.  Then, it reviews some
   implications of developing end-to-end transport protocols that use
   encryption to provide confidentiality of the transport protocol
   headers, or that use authentication to protect the integrity of
   transport header information.  Since measurement and analysis of the
   impact of network characteristics on transport protocols has been
   important to the design of current transports, it also considers the
   impact of transport encryption on transport and application
   evolution.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on February 24, 2020.

Copyright Notice

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

Fairhurst & Perkins     Expires February 24, 2020               [Page 1]
Internet-Draft            Transport Encryption               August 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Context and Rationale . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Use of Transport Header Information in the Network  . . .   4
     2.2.  Encryption of Transport Header Information  . . . . . . .   5
     2.3.  Encryption tradeoffs  . . . . . . . . . . . . . . . . . .   6
   3.  Current uses of Transport Headers within the Network  . . . .   8
     3.1.  Observing Transport Information in the Network  . . . . .   9
     3.2.  Transport Measurement . . . . . . . . . . . . . . . . . .  15
     3.3.  Use for Network Diagnostics and Troubleshooting . . . . .  19
     3.4.  Header Compression  . . . . . . . . . . . . . . . . . . .  20
   4.  Encryption and Authentication of Transport Headers  . . . . .  21
   5.  Addition of Transport Information to Network-Layer Protocol
       Headers . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
   6.  Implications of Protecting the Transport Headers  . . . . . .  25
     6.1.  Independent Measurement . . . . . . . . . . . . . . . . .  26
     6.2.  Characterising "Unknown" Network Traffic  . . . . . . . .  28
     6.3.  Accountability and Internet Transport Protocols . . . . .  28
     6.4.  Impact on Operational Cost  . . . . . . . . . . . . . . .  28
     6.5.  Impact on Research, Development and Deployment  . . . . .  29
   7.  Conclusions . . . . . . . . . . . . . . . . . . . . . . . . .  30
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  33
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  35
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  35
   11. Informative References  . . . . . . . . . . . . . . . . . . .  36
   Appendix A.  Revision information . . . . . . . . . . . . . . . .  43
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  44

1.  Introduction

   There is increased interest in, and deployment of, protocols that
   employ end-to-end encryption at the transport layer, including the
   transport layer headers.  An example of such a transport is the QUIC
   transport protocol [I-D.ietf-quic-transport], currently being
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