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Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) Freshness Extension (RFC8070)

IP.com Disclosure Number: IPCOM000249335D
Original Publication Date: 2017-Feb-01
Included in the Prior Art Database: 2017-Feb-17
Document File: 18 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Short: AUTHOR [+4]


The Kerberos PKINIT extension [RFC4556] defines two schemes for using asymmetric cryptography in a Kerberos pre-authenticator. One uses Diffie-Hellman key exchange and the other depends on public key encryption. The public key encryption scheme is less commonly used for two reasons:

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Internet Engineering Task Force (IETF)                     M. Short, Ed. Request for Comments: 8070                                      S. Moore Category: Standards Track                                      P. Miller ISSN: 2070-1721                                    Microsoft Corporation                                                            February 2017

 Public Key Cryptography for Initial Authentication in Kerberos (PKINIT)                           Freshness Extension


   This document describes how to further extend the Public Key    Cryptography for Initial Authentication in Kerberos (PKINIT)    extension (defined in RFC 4556) to exchange an opaque data blob that    a Key Distribution Center (KDC) can validate to ensure that the    client is currently in possession of the private key during a PKINIT    Authentication Service (AS) exchange.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc8070.

Copyright Notice

   Copyright (c) 2017 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    (http://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.  Code Components extracted from this document must    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.

 Short, et al.                Standards Track                    [Page 1]
 RFC 8070                    PKINIT Freshness               February 2017

 Table of Contents

   1. Introduction ....................................................2

      1.1. Kerberos Message Flow Using KRB_AS_REQ without

           Pre-authentication .........................................3

      1.2. Requirements Language ......................................3

   2. Message Exchang...