Efficient Hinting for Privacy Preserving DNS-SD using Bloomfilters
draft-kaiser-dnssd-bloomfilter-hints-00

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Network Working Group                                          D. Kaiser
Internet-Draft                                  University of Luxembourg
Intended status: Standards Track                       November 16, 2018
Expires: May 20, 2019

   Efficient Hinting for Privacy Preserving DNS-SD using Bloomfilters
                draft-kaiser-dnssd-bloomfilter-hints-00

Abstract

   While DNS-SD over mDNS significantly improves the convenience of
   network configuration, parts of the published information may
   seriously breach the users' privacy.  Currently discussed privacy
   extensions either are not efficient in terms of multicast messages
   sent, reduce privacy and complicate key revocation by introducing an
   1:m pairing system, or use trial encryptions which are inefficient in
   terms of necessary computational power.

   The method proposed in this document leverages Bloomfilters to
   significantly reduce the number of multicast (public) messages for a
   DNS-SD privacy extension based on an 1:1 pairing mechanism.  This
   allows keeping the advantages of both an 1:1 pairing system and a
   hinting system that does not require trial encryptions, while
   mitigating the main disadvantage: multicast messages sent.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 20, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Kaiser                    Expires May 20, 2019                  [Page 1]
Internet-Draft          DNS-SD Bloomfilter Hints           November 2018

   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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Bloomfilter-based Discovery Protocol  . . . . . . . . . . . .   3
     2.1.  Basic Idea  . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Direct Resolving  . . . . . . . . . . . . . . . . . . . .   5
   3.  Bloomfilter Hints . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Performance Analysis  . . . . . . . . . . . . . . . . . .   5
     3.2.  Construction of Bloomfilter Hints . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Informative References  . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   DNS-SD [RFC6763] over mDNS [RFC6762] enables zero-configuration
   service discovery in local networks.  While it significantly improves
   the convenience of network configuration, parts of the published
   information may seriously breach the users' privacy.  These privacy
   issues and potential solutions are discussed in [KW14a], [KW14b], and
   [K17].

   [[TODO]]

   This document proposes leveraging Bloomfilters to significantly
   reduce the number of multicast (public) messages for a DNS-SD privacy
   extension like [I-D.ietf-dnssd-privacy], which is based on an 1:1
   pairing mechanism (e.g.  [I-D.ietf-dnssd-pairing]).

1.1.  Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Kaiser                    Expires May 20, 2019                  [Page 2]
Internet-Draft          DNS-SD Bloomfilter Hints           November 2018

2.  Bloomfilter-based Discovery Protocol

2.1.  Basic Idea

   Instead of transmitting a lot of discovery messages containing
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