AES Encryption with HMAC-SHA2 for Kerberos 5
draft-ietf-kitten-aes-cts-hmac-sha2-02

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Document Type Active Internet-Draft (kitten WG)
Authors Michael Jenkins  , Michael Peck  , Kelley Burgin 
Last updated 2014-05-06
Stream Internent Engineering Task Force (IETF)
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Network Working Group                                         M. Jenkins
Internet Draft                                  National Security Agency
Intended Status: Informational                                   M. Peck
Expires: November 7, 2014                          The MITRE Corporation
                                                               K. Burgin
                                                             May 6, 2014

              AES Encryption with HMAC-SHA2 for Kerberos 5
                 draft-ietf-kitten-aes-cts-hmac-sha2-02

Abstract

   This document specifies two encryption types and two corresponding
   checksum types for Kerberos 5.  The new types use AES in CTS mode
   (CBC mode with ciphertext stealing) for confidentiality and HMAC with
   a SHA-2 hash for integrity.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 20, 2014.

Copyright and License Notice

   Copyright (c) 2014 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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.
 

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Protocol Key Representation  . . . . . . . . . . . . . . . . .  3
   3.  Key Derivation Function  . . . . . . . . . . . . . . . . . . .  3
   4.  Key Generation from Pass Phrases . . . . . . . . . . . . . . .  4
   5.  Kerberos Algorithm Protocol Parameters . . . . . . . . . . . .  5
   6.  Checksum Parameters  . . . . . . . . . . . . . . . . . . . . .  6
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  7
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . .  7
     8.1.  Random Values in Salt Strings  . . . . . . . . . . . . . .  7
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  8
   10.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  8
     10.1.  Normative References  . . . . . . . . . . . . . . . . . .  8
     10.2.  Informative References  . . . . . . . . . . . . . . . . .  8
   Appendix A.  Test Vectors  . . . . . . . . . . . . . . . . . . . .  9
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15

 

Jenkins, et al.         Expires November 7, 2014                [Page 2]
Internet-Draft      AES-CTS HMAC-SHA2 For Kerberos 5         May 6, 2014

1.  Introduction

   This document defines two encryption types and two corresponding
   checksum types for Kerberos 5 using AES with 128-bit or 256-bit keys.

   To avoid ciphertext expansion, we use a variation of the CBC-CS3 mode
   defined in [SP800-38A+], also referred to as ciphertext stealing or
   CTS mode.  The new types conform to the framework specified in
   [RFC3961], but do not use the simplified profile.

   The encryption and checksum types defined in this document are
   intended to support environments that desire to use SHA-256 or SHA-
   384 as the hash algorithm.  Differences between the encryption and
   checksum types defined in this document and the pre-existing Kerberos
   AES encryption and checksum types specified in [RFC3962] are:

   *  The pseudorandom function used by PBKDF2 is HMAC-SHA-256 or HMAC-
      SHA-384.

   *  A key derivation function from [SP800-108] using the SHA-256 or
      SHA-384 hash algorithm is used to produce keys for encryption,
      integrity protection, and checksum operations.

   *  The HMAC is calculated over the cipherstate concatenated with the
      AES output, instead of being calculated over the confounder and
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