Fine-grained Support of Security Services for Constrained Devices using DTLS
draft-choi-dice-finegrained-dtls-security-00

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DICE Working Group                                          Jaeduck Choi
Internet Draft                                                Gunhee Lee
Intended status: Standards Track                                    NSRI
Expires: April 26, 2015                                       Namhi Kang
                                              Duksung Women's University
                                                          Seungwook Jung
                                                            Souhwan Jung
                                                     Soongsil University
                                                        October 27, 2014

                 Fine-grained Support of Security Services
                   for Constrained Devices using DTLS
              draft-choi-dice-finegrained-dtls-security-00.txt

Abstract

   This document proposes a method that can selectively apply
   application data encryption to the DTLS record layer. The CoAP used
   for resource-constrained devices defines the use of DTLS as a basic
   security mechanism, and CoAP standard specifies the use of AES_CCM
   that provides data integrity and confidentiality as a cipher suite
   for DTLS. However, not all CoAP messages require both data integrity
   and confidentiality. For example, in case of CoAP messages that
   include information for turning a light off at home or in a building,
   or simple ACK information, encryption might not be necessary because
   such information might not be useful to attackers. Furthermore, from
   the perspective of effective resource use of resource-constrained
   devices, reducing the computation load required to perform data
   encryption every time is necessary. This document describes the
   methods for CoAP nodes to establish DTLS security channels using the
   AES_CCM cipher suite, and to selectively apply the encryption
   function in the DTLS record layer by considering sensitivity to
   application data leakage

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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   Drafts.

Choi                    Expires April 26, 2015                  [Page 1]

Internet-Draft  Fine-grained Support of DTLS Security      October 2014

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Table of Contents

   1. Introduction ................................................... 3
   2. Terminology .................................................... 4
   3. Overview ....................................................... 4
   4. Protocol Operations ............................................ 7
      4.1. DTLS Record Layer Header .................................. 7
      4.2. Node Behaviors ............................................ 8
         4.2.1. Sender ............................................... 8
         4.2.2. Receiver ............................................. 9
   5. Security Considerations ........................................ 9
   6. IANA Considerations ............................................ 9
   7. References .................................................... 10
      7.1. Normative References ..................................... 10
      7.2. Informative References ................................... 10
   8. Acknowledgments ............................................... 10

Choi                    Expires April 26, 2015                  [Page 2]

Internet-Draft  Fine-grained Support of DTLS Security      October 2014

1. Introduction

   IETF CoRE WG has standardized Constrained Application Protocol
   (CoAP), which can be used for resource-constrained devices [RFC
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