Mathematical Mesh 3.0 Part VIII: Cryptographic Algorithms
draft-hallambaker-mesh-cryptography-05

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Network Working Group                                 P. M. Hallam-Baker
Internet-Draft                                           16 January 2020
Intended status: Informational                                          
Expires: 19 July 2020

       Mathematical Mesh 3.0 Part VIII: Cryptographic Algorithms
                 draft-hallambaker-mesh-cryptography-05

Abstract

   The Mathematical Mesh 'The Mesh' is an infrastructure that
   facilitates the exchange of configuration and credential data between
   multiple user devices and provides end-to-end security.  This
   document describes the cryptographic algorithm suites used in the
   Mesh and the implementation of Multi-Party Encryption and Multi-Party
   Key Generation used in the Mesh.

   [Note to Readers]

   Discussion of this draft takes place on the MATHMESH mailing list
   (mathmesh@ietf.org), which is archived at
   https://mailarchive.ietf.org/arch/search/?email_list=mathmesh.

   This document is also available online at
   http://mathmesh.com/Documents/draft-hallambaker-mesh-
   cryptography.html.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 19 July 2020.

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Copyright Notice

   Copyright (c) 2020 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.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Defined Terms . . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Related Specifications  . . . . . . . . . . . . . . . . .   4
     2.4.  Implementation Status . . . . . . . . . . . . . . . . . .   4
   3.  Recommended and Required Algorithms . . . . . . . . . . . . .   4
     3.1.  Mesh Device . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Constrained Device  . . . . . . . . . . . . . . . . . . .   5
   4.  Multi-Party Cryptography  . . . . . . . . . . . . . . . . . .   6
     4.1.  Application to Diffie Hellman (not normative) . . . . . .   6
     4.2.  Multi-Party Key Generation  . . . . . . . . . . . . . . .   6
     4.3.  Multi-Party Decryption  . . . . . . . . . . . . . . . . .   7
     4.4.  Mutually Authenticated Key Exchange.  . . . . . . . . . .   7
     4.5.  Implementation  . . . . . . . . . . . . . . . . . . . . .   7
       4.5.1.  Implementation for Ed25519 and Ed448  . . . . . . . .   8
       4.5.2.  Implementation for X25519 and X448  . . . . . . . . .   8
   5.  Multi-Party Key Generation  . . . . . . . . . . . . . . . . .   9
     5.1.  Example: Provisioning the Confirmation Service  . . . . .   9
   6.  Multi-Party Decryption  . . . . . . . . . . . . . . . . . . .  11
     6.1.  Mechanism . . . . . . . . . . . . . . . . . . . . . . . .  12
     6.2.  Implementation  . . . . . . . . . . . . . . . . . . . . .  13
       6.2.1.  Group Creation  . . . . . . . . . . . . . . . . . . .  13
       6.2.2.  Provisioning a Member . . . . . . . . . . . . . . . .  14
       6.2.3.  Message Encryption and Decryption . . . . . . . . . .  14
     6.3.  Example: Messaging group  . . . . . . . . . . . . . . . .  15
   7.  Mutually Authenticated Key Agreement  . . . . . . . . . . . .  17
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  19
   11. Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  19
     11.1.  Key Combination  . . . . . . . . . . . . . . . . . . . .  19
       11.1.1.  Ed25519  . . . . . . . . . . . . . . . . . . . . . .  19
       11.1.2.  Ed448  . . . . . . . . . . . . . . . . . . . . . . .  19
       11.1.3.  X25519 . . . . . . . . . . . . . . . . . . . . . . .  19

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