Randomized Response Mechanisms in RTT Measurements for QUIC
draft-andersdotter-rrm-for-rtt-in-quic-00

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Internet Research Task Force                             A. Andersdotter
Internet-Draft                                                     CENTR
Intended status: Informational                                  S. Sahib
Expires: January 14, 2021                                     Salesforce
                                                           July 13, 2020

      Randomized Response Mechanisms in RTT Measurements for QUIC
               draft-andersdotter-rrm-for-rtt-in-quic-00

Abstract

   The latency spin bit is an optional feature included in the QUIC
   transport protocol, as standardized by the Internet Engineering Task
   Force (IETF).  It enables passive, on-path observations for
   estimation of latency.  This document presents the results of an
   inquiry into the potential of using randomized response mechanisms
   (RRM) to reduce privacy loss in latency measurements.  It concludes
   that RRM could be used to introduce choice for clients in preserving
   privacy in latency measurements.  But the trade-offs, especially
   since the latency spin bit is already optional, do not favour RRM.

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Andersdotter & Sahib    Expires January 14, 2021                [Page 1]
Internet-Draft             rrm-for-rtt-in-quic                 July 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Randomized Response Mechanisms  . . . . . . . . . . . . . . .   2
   3.  Application to latency spin bit . . . . . . . . . . . . . . .   4
   4.  Spin bit assumptions  . . . . . . . . . . . . . . . . . . . .   6
   5.  Model specification . . . . . . . . . . . . . . . . . . . . .   8
   6.  Simulation  . . . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Edge transition RRM . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  One and a half round-trip explained . . . . . . . . . . .   9
     7.2.  A closer look at the loop . . . . . . . . . . . . . . . .  10
     7.3.  Using model to restrict measurements  . . . . . . . . . .  11
   8.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .  12
   9.  Informative References  . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   At the IETF104 convening of the Privacy Enhancements and Assessments
   Research Group (PEARG), a presentation on Differential Privacy
   ([AA-CL]) gave rise to the idea of trying to apply randomized
   response methods to the QUIC spin bit described in [TRAMMEL] and
   [KUEHLEWIND].  The spin bit, now incorporated in Section 17.3.1
   [I-D-QUIC], has generated controversy from a privacy perspective,
   both in the Working Group meetings and on the QUIC email list.
   Controversies were re-ignited through the publication of a Human
   Rights Consideration in [TENOEVER-MARTINI] in 2019.  Applying RRM is
   an attempt to address two problems: the privacy loss incurred through
   the spin bit, and considering the potential of using RRM to have more
   than one bit assisting in latency measurement as per previous
   proposals.

2.  Randomized Response Mechanisms

   Randomized response trials were originally suggested by social
   scientist Stanley Warner to increase response rates in surveys on
   sensitive topics, such as political affiliation or sexuality
   [WARNER].  At the flip of a coin (or other random device), a survey
   taker would answer the opposite question to the one that the survey
   giver wanted to ask.  For instance, if the survey giver wants to find
   out whether a person has been affiliated with a communist group, the
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