A Taxonomy of operational security of manufacturer installed keys and anchors
draft-richardson-t2trg-idevid-considerations-01
anima Working Group M. Richardson
Internet-Draft Sandelman Software Works
Intended status: Informational J. Yang
Expires: 28 February 2021 Huawei Technologies Co., Ltd.
27 August 2020
A Taxonomy of operational security of manufacturer installed keys and
anchors
draft-richardson-t2trg-idevid-considerations-01
Abstract
This document provides a toxonomy of methods by manufacturers of
silicon and devices secure private keys and public trust anchors.
This deals with two related activities: how trust anchors and private
keys are installed into devices during manufacturing, and how the
related manufacturer held private keys are secured against
disclosure.
This document does not evaluate the different mechanisms, but rather
just serves to name them in a consistent manner in order to aid in
communication.
RFCEDITOR: please remove this paragraph. This work is occurring in
https://github.com/mcr/idevid-security-considerations
Status of This Memo
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document authors. All rights reserved.
Richardson & Yang Expires 28 February 2021 [Page 1]
Internet-Draft IDevID Considerations August 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. Applicability Model . . . . . . . . . . . . . . . . . . . . . 5
2.1. A reference manufacturing/boot process . . . . . . . . . 5
3. Types of Trust Anchors . . . . . . . . . . . . . . . . . . . 7
3.1. Secured First Boot Trust Anchor . . . . . . . . . . . . . 8
3.2. Software Update Trust Anchor . . . . . . . . . . . . . . 8
3.3. Trusted Application Manager anchor . . . . . . . . . . . 8
3.4. Public WebPKI anchors . . . . . . . . . . . . . . . . . . 9
3.5. DNSSEC root . . . . . . . . . . . . . . . . . . . . . . . 9
3.6. What else? . . . . . . . . . . . . . . . . . . . . . . . 9
4. Types of Identities . . . . . . . . . . . . . . . . . . . . . 9
4.1. Manufacturer installed IDevID certificates . . . . . . . 10
4.1.1. Operational Considerations for Manufacturer IDevID
Public Key Infrastructure . . . . . . . . . . . . . . 10
4.1.2. Key Generation process . . . . . . . . . . . . . . . 11
5. Public Key Infrastructures (PKI) . . . . . . . . . . . . . . 14
5.1. Number of levels of certification authorities . . . . . . 15
5.2. Protection of CA private keys . . . . . . . . . . . . . . 16
5.3. Supporting provisioned anchors in devices . . . . . . . . 17
6. Evaluation Questions . . . . . . . . . . . . . . . . . . . . 17
6.1. Integrity and Privacy of on-device data . . . . . . . . . 17
6.2. Integrity and Privacy of device identify
infrastructure . . . . . . . . . . . . . . . . . . . . . 18
6.3. Integrity and Privacy of included trust anchors . . . . . 18
7. Privacy Considerations . . . . . . . . . . . . . . . . . . . 19
8. Security Considerations . . . . . . . . . . . . . . . . . . . 19
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 19
11. Changelog . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
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