Suite B Cryptographic Suites for Secure Shell (SSH)
RFC 6239

 
Document Type RFC - Informational (May 2011; No errata)
Was draft-igoe-secsh-suiteb (individual in sec area)
Last updated 2013-03-02
Stream IETF
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Stream WG state (None)
Consensus Unknown
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IESG IESG state RFC 6239 (Informational)
Telechat date
Responsible AD Tim Polk
IESG note need a shepherd... should review to see if we can go standards track even with ECC
Send notices to kmigoe@nsa.gov, draft-igoe-secsh-suiteb@ietf.org
Internet Engineering Task Force (IETF)                           K. Igoe
Request for Comments: 6239                      National Security Agency
Category: Informational                                         May 2011
ISSN: 2070-1721

          Suite B Cryptographic Suites for Secure Shell (SSH)

Abstract

   This document describes the architecture of a Suite B compliant
   implementation of the Secure Shell Transport Layer Protocol and the
   Secure Shell Authentication Protocol.  Suite B Secure Shell makes use
   of the elliptic curve Diffie-Hellman (ECDH) key agreement, the
   elliptic curve digital signature algorithm (ECDSA), the Advanced
   Encryption Standard running in Galois/Counter Mode (AES-GCM), two
   members of the SHA-2 family of hashes (SHA-256 and SHA-384), and
   X.509 certificates.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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/rfc6239.

Igoe                          Informational                     [Page 1]
RFC 6239              Suite B Crypto Suites for SSH             May 2011

Copyright Notice

   Copyright (c) 2011 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.

Table of Contents

   1. Introduction ....................................................3
   2. Suite B and Secure Shell ........................................3
      2.1. Minimum Levels of Security (minLOS) ........................4
      2.2. Digital Signatures and Certificates ........................4
      2.3. Non-Signature Primitives ...................................5
   3. Security Mechanism Negotiation and Initialization ...............6
      3.1. Algorithm Negotiation: SSH_MSG_KEXINIT .....................7
   4. Key Exchange and Server Authentication ..........................8
      4.1. SSH_MSG_KEXECDH_INIT .......................................9
      4.2. SSH_MSG_KEXECDH_REPLY ......................................9
      4.3. Key and Initialization Vector Derivation ..................10
   5. User Authentication ............................................10
      5.1. First SSH_MSG_USERAUTH_REQUEST Message ....................10
      5.2. Second SSH_MSG_USERAUTH_REQUEST Message ...................11
   6. Confidentiality and Data Integrity of SSH Binary Packets .......12
      6.1. Galois/Counter Mode .......................................12
      6.2. Data Integrity ............................................12
   7. Rekeying .......................................................12
   8. Security Considerations ........................................13
   9. References .....................................................13
      9.1. Normative References ......................................13
      9.2. Informative References ....................................13

Igoe                          Informational                     [Page 2]
RFC 6239              Suite B Crypto Suites for SSH             May 2011

1.  Introduction

   This document describes the architecture of a Suite B compliant
   implementation of the Secure Shell Transport Layer Protocol and the
   Secure Shell Authentication Protocol.  Suite B Secure Shell makes use
   of the elliptic curve Diffie-Hellman (ECDH) key agreement, the
   elliptic curve digital signature algorithm (ECDSA), the Advanced
   Encryption Standard running in Galois/Counter Mode (AES-GCM), two
   members of the SHA-2 family of hashes (SHA-256 and SHA-384), and
   X.509 certificates.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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