BGPsec Design Choices and Summary of Supporting Discussions
draft-sriram-bgpsec-design-choices-15

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Independent Submission                                    K. Sriram, Ed.
Internet-Draft                                                  USA NIST
Intended status: Informational                          January 18, 2018
Expires: July 22, 2018

      BGPsec Design Choices and Summary of Supporting Discussions
                 draft-sriram-bgpsec-design-choices-15

Abstract

   This document is written to capture the design rationale primarily
   for the individual draft-00 version of BGPsec protocol specification
   [I-D.lepinski-bgpsec-protocol].  However, where appropriate, the
   document also provides brief notes on design decisions that changed
   (relative to individual draft-00 version) in the finalized protocol
   specification [RFC8205].  The notes mention what the differences are
   and provide pointers to where the details and/or rationale can be
   found about those changes in design.  The document lists the
   decisions that were made in favor of or against each design choice,
   and presents brief summaries of the arguments that aided the decision
   process.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 22, 2018.

Copyright Notice

   Copyright (c) 2018 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

Sriram                    Expires July 22, 2018                 [Page 1]
Internet-Draft            BGPsec Design Choices             January 2018

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Creating Signatures and the Structure of BGPsec Update
       Messages  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Origin Validation Using ROA . . . . . . . . . . . . . . .   4
     2.2.  Attributes Signed by an Originating AS  . . . . . . . . .   5
     2.3.  Attributes Signed by an Upstream AS . . . . . . . . . . .   6
     2.4.  What Attributes Are Not Signed  . . . . . . . . . . . . .   7
     2.5.  Receiving Router Actions  . . . . . . . . . . . . . . . .   8
     2.6.  Prepending of ASes in AS Path . . . . . . . . . . . . . .   9
     2.7.  What RPKI Data Need be Included in Updates  . . . . . . .   9
   3.  Withdrawal Protection . . . . . . . . . . . . . . . . . . . .  10
     3.1.  Withdrawals Not Signed  . . . . . . . . . . . . . . . . .  10
     3.2.  Signature Expire Time for Withdrawal Protection (a.k.a.
           Mitigation of Replay Attacks) . . . . . . . . . . . . . .  10
     3.3.  Should Route Expire Time be Communicated in a Separate
           Message . . . . . . . . . . . . . . . . . . . . . . . . .  12
     3.4.  Effect of Expire-Time Updates in BGPsec on RFD  . . . . .  13
   4.  Signature Algorithms and Router Keys  . . . . . . . . . . . .  14
     4.1.  Signature Algorithms  . . . . . . . . . . . . . . . . . .  14
     4.2.  Agility of Signature Algorithms . . . . . . . . . . . . .  15
     4.3.  Sequential Aggregate Signatures . . . . . . . . . . . . .  16
     4.4.  Protocol Extensibility  . . . . . . . . . . . . . . . . .  17
     4.5.  Key Per Router (Rogue Router Problem) . . . . . . . . . .  18
     4.6.  Router ID . . . . . . . . . . . . . . . . . . . . . . . .  18
   5.  Optimizations and Resource Sizing . . . . . . . . . . . . . .  18
     5.1.  Update Packing and Repacking  . . . . . . . . . . . . . .  19
     5.2.  Signature Per Prefix vs. Signature Per Update . . . . . .  19
     5.3.  Maximum BGPsec Update PDU Size  . . . . . . . . . . . . .  20
     5.4.  Temporary Suspension of Attestations and Validations  . .  21
   6.  Incremental Deployment and Negotiation of BGPsec  . . . . . .  22
     6.1.  Downgrade Attacks . . . . . . . . . . . . . . . . . . . .  22
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