Re-keying Mechanisms for Symmetric Keys
draft-irtf-cfrg-re-keying-02

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CFRG                                                  S. Smyshlyaev, Ed.
Internet-Draft                                                 CryptoPro
Intended status: Informational                              June 5, 2017
Expires: December 7, 2017

                Re-keying Mechanisms for Symmetric Keys
                      draft-irtf-cfrg-re-keying-02

Abstract

   If encryption is performed under a single key, there is a certain
   maximum threshold amount of data that can be safely encrypted.  This
   amount is called key lifetime.  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 based on hash functions and on block ciphers that can be
   used with such modes of operations as CTR, GCM, CCM, CBC, CFB, OFB
   and OMAC.

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Smyshlyaev              Expires December 7, 2017                [Page 1]
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   5
   3.  Basic Terms and Definitions . . . . . . . . . . . . . . . . .   5
   4.  Principles of Choice of Constructions and Security Parameters   6
   5.  External Re-keying Mechanisms . . . . . . . . . . . . . . . .   8
     5.1.  Methods of Key Lifetime Control . . . . . . . . . . . . .  10
     5.2.  Parallel Constructions  . . . . . . . . . . . . . . . . .  11
       5.2.1.  Parallel Construction Based on a KDF on a Block
               Cipher  . . . . . . . . . . . . . . . . . . . . . . .  12
       5.2.2.  Parallel Construction Based on HKDF . . . . . . . . .  12
     5.3.  Serial Constructions  . . . . . . . . . . . . . . . . . .  13
       5.3.1.  Serial Construction Based on a KDF on a Block Cipher   13
       5.3.2.  Serial Construction Based on HKDF . . . . . . . . . .  14
   6.  Internal Re-keying Mechanisms . . . . . . . . . . . . . . . .  14
     6.1.  Methods of Key Lifetime Control . . . . . . . . . . . . .  16
     6.2.  Constructions that Do Not Require Master Key  . . . . . .  17
       6.2.1.  ACPKM Re-keying Mechanisms  . . . . . . . . . . . . .  17
       6.2.2.  CTR-ACPKM Encryption Mode . . . . . . . . . . . . . .  19
       6.2.3.  GCM-ACPKM Encryption Mode . . . . . . . . . . . . . .  21
       6.2.4.  CCM Mode Key Meshing  . . . . . . . . . . . . . . . .  23
     6.3.  Constructions that Require Master Key . . . . . . . . . .  25
       6.3.1.  ACPKM-Master Key Derivation from the Master Key . . .  25
       6.3.2.  CTR Mode Key Meshing  . . . . . . . . . . . . . . . .  26
       6.3.3.  GCM Mode Key Meshing  . . . . . . . . . . . . . . . .  29
       6.3.4.  CCM Mode Key Meshing  . . . . . . . . . . . . . . . .  32
       6.3.5.  CBC Mode Key Meshing  . . . . . . . . . . . . . . . .  32
       6.3.6.  CFB Mode Key Meshing  . . . . . . . . . . . . . . . .  34
       6.3.7.  OFB Mode Key Meshing  . . . . . . . . . . . . . . . .  36
       6.3.8.  OMAC Mode Key Meshing . . . . . . . . . . . . . . . .  37
   7.  Joint Usage of External and Internal Re-keying  . . . . . . .  39
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  39
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  40
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  40
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  40
   Appendix A.  Test examples  . . . . . . . . . . . . . . . . . . .  41
   Appendix B.  Contributors . . . . . . . . . . . . . . . . . . . .  45
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