Security Classes For Software Updates for IoT
draft-urien-suit-security-classes-00

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Last updated 2018-10-19
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SUIT Working Group                                           P. Urien 
  Internet Draft                                      Telecom ParisTech 
  Intended status: Experimental                                         
                                                                        
                                                       October 19, 2018 
  Expires: April 2019 
 
               Security Classes For Software Updates for IoT 
                  draft-urien-suit-security-classes-00.txt 
    
    
Abstract 
    
   This draft attempts to define security classes for devices targeted 
   by SUIT protocols. A device security is characterized by five 
   Boolean security attributes: firmware loader (FLD), one time 
   programmable memory (OTP), secure firmware loader (FLD-SEC), tamper 
   resistant key (TRT-KEY) and diversified key (DIV-KEY). This 
   classification creates 18 device classes. 
    
    
Requirements Language 
    
   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 
   document are to be interpreted as described in RFC 2119. 
    
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 
   Task Force (IETF). Note that other groups may also distribute 
   working documents as Internet-Drafts. The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/. 
    
   Internet-Drafts are draft documents valid for a maximum of six 
   months and may be updated, replaced, or obsoleted by other documents 
   at any time. It is inappropriate to use Internet-Drafts as reference 
   material or to cite them other than as "work in progress." 
    
   This Internet-Draft will expire on April 2019. 
    
   . 

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Copyright Notice 
    
   Copyright (c) 2018 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 
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  Security Classes For Software Updates for IoT   October 2018 
 
Table of Contents 
   Abstract........................................................... 1 
   Requirements Language.............................................. 1 
   Status of this Memo................................................ 1 
   Copyright Notice................................................... 2 
   1 Overview......................................................... 4 
   2 Security Considerations for Firmware Update...................... 5 
      2.1 Firmware Loader, FLD........................................ 5 
      2.2 One Time Programmable Memory, OTP........................... 5 
      2.3 Secure Firmware Loader, FLD-SEC............................. 5 
      2.4 Tamper Resistant Key, TRT-KEY............................... 6 
      2.5 Diversified Key, DIV-KEY.................................... 6 
   3 IANA Considerations.............................................. 6 
   4 Security Considerations.......................................... 6 
   5 References....................................................... 6 
      5.1 Normative References........................................ 6 
      5.2 Informative References...................................... 6 
   6 Authors' Addresses............................................... 6 
 

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  Security Classes For Software Updates for IoT   October 2018 
 
1 Overview 
    
   The [SUIT] working focuses on firmware update for Class 1 (as 
   defined in RFC 7228) devices, i.e., devices with ~10 KB RAM and ~100 
   KB flash. 
    
   This draft attempts to define security classes for devices targeted 
   by SUIT protocols. The goal is to provide a qualitative estimation 
   of risk induced by firmware remote updates according to device 
   logical and hardware security resources. 
    
   According to this draft a device comprises a main processor (MP), an 
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