Re-keying Mechanisms for Symmetric Keys
draft-irtf-cfrg-re-keying-01

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Last updated 2017-04-21 (latest revision 2017-03-07)
Replaces draft-cfrg-re-keying
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CFRG                                                  S. Smyshlyaev, Ed.
Internet-Draft                                                 CryptoPro
Intended status: Informational                                R. Housley
Expires: September 8, 2017                           Vigil Security, LLC
                                                              M. Bellare
                                     University of California, San Diego
                                                             E. Alekseev
                                                          E. Smyshlyaeva
                                                               CryptoPro
                                                           March 7, 2017

                Re-keying Mechanisms for Symmetric Keys
                      draft-irtf-cfrg-re-keying-01

Abstract

   This specification contains a description of a variety of methods to
   increase the lifetime of symmetric keys.  It provides external and
   internal re-keying mechanisms that can be used with such modes of
   operations as CTR, GCM, CBC, CFB, OFB and OMAC.

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 September 8, 2017.

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Internet-Draft   Re-keying Mechanisms for Symmetric Keys      March 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Basic Terms and Definitions . . . . . . . . . . . . . . . . .   3
   4.  External Re-keying Mechanisms . . . . . . . . . . . . . . . .   5
     4.1.  Parallel Constructions  . . . . . . . . . . . . . . . . .   5
       4.1.1.  Parallel Construction Based on a KDF on a Block
               Cipher  . . . . . . . . . . . . . . . . . . . . . . .   6
       4.1.2.  Parallel Construction Based on HKDF . . . . . . . . .   6
     4.2.  Serial Constructions  . . . . . . . . . . . . . . . . . .   7
       4.2.1.  Serial Construction Based on a KDF on a Block Cipher    7
       4.2.2.  Serial Construction Based on HKDF . . . . . . . . . .   8
   5.  Internal Re-keying Mechanisms . . . . . . . . . . . . . . . .   8
     5.1.  Constructions that Do Not Require Master Key  . . . . . .   8
       5.1.1.  ACPKM Re-keying Mechanisms  . . . . . . . . . . . . .   8
       5.1.2.  CTR-ACPKM Encryption Mode . . . . . . . . . . . . . .  10
       5.1.3.  GCM-ACPKM Encryption Mode . . . . . . . . . . . . . .  12
     5.2.  Constructions that Require Master Key . . . . . . . . . .  14
       5.2.1.  ACPKM-Master Key Generation from the Master Key . . .  15
       5.2.2.  CTR Mode Key Meshing  . . . . . . . . . . . . . . . .  16
       5.2.3.  GCM Mode Key Meshing  . . . . . . . . . . . . . . . .  19
       5.2.4.  CBC Mode Key Meshing  . . . . . . . . . . . . . . . .  22
       5.2.5.  CFB Mode Key Meshing  . . . . . . . . . . . . . . . .  24
       5.2.6.  OFB Mode Key Meshing  . . . . . . . . . . . . . . . .  26
       5.2.7.  OMAC Mode Key Meshing . . . . . . . . . . . . . . . .  27
   6.  Joint Usage of External and Internal Re-keying  . . . . . . .  29
   7.  Scope of Usage of Rekeying-Based Schemas  . . . . . . . . . .  29
     7.1.  Key Transformation Rules  . . . . . . . . . . . . . . . .  29
     7.2.  Principles of Choice of Constructions and Security
           Parameters  . . . . . . . . . . . . . . . . . . . . . . .  30
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  32
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