Secure Password Ciphersuites for Transport Layer Security (TLS)
draft-harkins-tls-dragonfly-03

Document Type Active Internet-Draft (individual)
Last updated 2018-07-02
Replaces draft-ietf-tls-pwd
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Transport Layer Security                                 D. Harkins, Ed.
Internet-Draft                                             HP Enterprise
Intended status: Informational                              July 2, 2018
Expires: January 3, 2019

    Secure Password Ciphersuites for Transport Layer Security (TLS)
                     draft-harkins-tls-dragonfly-03

Abstract

   This memo defines several new ciphersuites for the Transport Layer
   Security (TLS) protocol to support certificate-less, secure
   authentication using only a simple, low-entropy, password.  The
   exchange is called TLS-PWD.  The ciphersuites are all based on an
   authentication and key exchange protocol, named "dragonfly", that is
   resistant to off-line dictionary attack.

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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   This Internet-Draft will expire on January 3, 2019.

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
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   include Simplified BSD License text as described in Section 4.e of

Harkins                  Expires January 3, 2019                [Page 1]
Internet-Draft                TLS Password                     July 2018

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  The Case for Certificate-less Authentication  . . . . . .   3
     1.2.  Resistance to Dictionary Attack . . . . . . . . . . . . .   3
   2.  Keyword Definitions . . . . . . . . . . . . . . . . . . . . .   4
   3.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Notation  . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Discrete Logarithm Cryptography . . . . . . . . . . . . .   5
       3.2.1.  Elliptic Curve Cryptography . . . . . . . . . . . . .   5
       3.2.2.  Finite Field Cryptography . . . . . . . . . . . . . .   7
     3.3.  Instantiating the Random Function . . . . . . . . . . . .   8
     3.4.  Passwords . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.5.  Assumptions . . . . . . . . . . . . . . . . . . . . . . .   9
   4.  Specification of the TLS-PWD Handshake  . . . . . . . . . . .   9
     4.1.  TLS-PWD pre-TLS 1.3 . . . . . . . . . . . . . . . . . . .  10
     4.2.  TLS-PWD in TLS 1.3  . . . . . . . . . . . . . . . . . . .  10
     4.3.  Protecting the Username . . . . . . . . . . . . . . . . .  10
       4.3.1.  Construction of a Protected Username  . . . . . . . .  11
       4.3.2.  Recovery of a Protected Username  . . . . . . . . . .  12
     4.4.  Fixing the Password Element . . . . . . . . . . . . . . .  13
       4.4.1.  Computing an ECC Password Element . . . . . . . . . .  15
       4.4.2.  Computing an FFC Password Element . . . . . . . . . .  17
       4.4.3.  Password Naming . . . . . . . . . . . . . . . . . . .  18
       4.4.4.  Generating TLS-PWD Commit . . . . . . . . . . . . . .  18
     4.5.  Changes to Handshake Message Contents . . . . . . . . . .  19
       4.5.1.  Changes to pre-1.3 TLS  . . . . . . . . . . . . . . .  19
         4.5.1.1.  Client Hello Changes  . . . . . . . . . . . . . .  19
         4.5.1.2.  Server Key Exchange Changes . . . . . . . . . . .  19
         4.5.1.3.  Client Key Exchange Changes . . . . . . . . . . .  21
       4.5.2.  Changes to TLS 1.3  . . . . . . . . . . . . . . . . .  23
         4.5.2.1.  TLS 1.3 KeyShare  . . . . . . . . . . . . . . . .  23
         4.5.2.2.  Client Hello Changes  . . . . . . . . . . . . . .  23
         4.5.2.3.  Server Hello Changes  . . . . . . . . . . . . . .  24
         4.5.2.4.  Hello Retry Request Changes . . . . . . . . . . .  24
     4.6.  Computing the Shared Secret . . . . . . . . . . . . . . .  24
   5.  Ciphersuite Definition  . . . . . . . . . . . . . . . . . . .  25
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  25
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
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