Browse Prior Art Database

Secure Pre-Shared Key (PSK) Authentication for the Internet Key Exchange Protocol (IKE) (RFC6617)

IP.com Disclosure Number: IPCOM000218325D
Original Publication Date: 2012-Jun-01
Included in the Prior Art Database: 2012-Jun-02
Document File: 48 page(s) / 54K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Harkins: AUTHOR

Abstract

[RFC5996] allows for authentication of the IKE peers using a pre- shared key. This exchange, though, is susceptible to dictionary attack and is therefore insecure when used with weak pre-shared keys, such as human-memorizable passwords. To address the security issue, [RFC5996] recommends that the pre-shared key used for authentication "contain as much unpredictability as the strongest key being negotiated". That means any non-hexadecimal key would require over 100 characters to provide enough strength to generate a 128-bit key suitable for AES. This is an unrealistic requirement because humans have a hard time entering a string over 20 characters without error. Consequently, pre-shared key authentication in [RFC5996] is used insecurely today.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 5% of the total text.

Internet Engineering Task Force (IETF)                        D. Harkins Request for Comments: 6617                                Aruba Networks Category: Experimental                                         June 2012 ISSN: 2070-1721

                Secure Pre-Shared Key (PSK) Authentication               for the Internet Key Exchange Protocol (IKE)

Abstract

   This memo describes a secure pre-shared key (PSK) authentication    method for the Internet Key Exchange Protocol (IKE).  It is resistant    to dictionary attack and retains security even when used with weak    pre-shared keys.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for examination, experimental implementation, and    evaluation.

   This document defines an Experimental Protocol for the Internet    community.  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).  Not    all documents approved by the IESG are a candidate for any level of    Internet Standard; see Section 2 of RFC 5741.

   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/rfc6617.

Copyright Notice

   Copyright (c) 2012 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.

Harkins                       Experimental                      [Page 1]
 RFC 6617            Secure PSK Authentication for IKE          June 2012

 Table of Contents

   1. Introduction ....................................................3

      1.1. Keyword Definitions ........................................3

   2. Usage Scenarios .................................................3

   3. Terms and Notation ..............................................4

   4. Discrete Logarithm Cryptography .................................5

      4.1. Elliptic Curve Cryptography (ECP) Groups ...................5

      4.2....