Roughtime
draft-ietf-ntp-roughtime-02
Internet Engineering Task Force A. Malhotra
Internet-Draft Boston University
Intended status: Informational A. Langley
Expires: December 3, 2020 Google
W. Ladd
Cloudflare
June 01, 2020
Roughtime
draft-ietf-ntp-roughtime-02
Abstract
This document specifies Roughtime - a protocol that aims to achieve
rough time synchronization while detecting servers that provide
inaccurate time and providing cryptographic proof of their
malfeasance.
Status of This Memo
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This Internet-Draft will expire on December 3, 2020.
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Copyright (c) 2020 IETF Trust and the persons identified as the
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Malhotra, et al. Expires December 3, 2020 [Page 1]
Internet-Draft Roughtime June 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 4
3. Protocol Overview . . . . . . . . . . . . . . . . . . . . . . 4
4. The Guarantee . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Message Format . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. Data Types . . . . . . . . . . . . . . . . . . . . . . . 6
5.1.1. int32 . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1.2. uint32 . . . . . . . . . . . . . . . . . . . . . . . 6
5.1.3. uint64 . . . . . . . . . . . . . . . . . . . . . . . 6
5.1.4. Tag . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1.5. Timestamp . . . . . . . . . . . . . . . . . . . . . . 7
5.2. Header . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1. Requests . . . . . . . . . . . . . . . . . . . . . . . . 9
6.2. Responses . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3. The Merkle Tree . . . . . . . . . . . . . . . . . . . . . 11
6.3.1. Root Value Validity Check Algorithm . . . . . . . . . 12
6.4. Validity of Response . . . . . . . . . . . . . . . . . . 12
7. Integration into NTP . . . . . . . . . . . . . . . . . . . . 12
8. Cheater Detection . . . . . . . . . . . . . . . . . . . . . . 13
9. Grease . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
10. Roughtime Servers . . . . . . . . . . . . . . . . . . . . . . 14
11. Trust Anchors and Policies . . . . . . . . . . . . . . . . . 14
12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 14
13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
13.1. Service Name and Transport Protocol Port Number Registry 15
13.2. Roughtime Version Registry . . . . . . . . . . . . . . . 15
13.3. Roughtime Tag Registry . . . . . . . . . . . . . . . . . 15
14. Security Considerations . . . . . . . . . . . . . . . . . . . 16
15. Privacy Considerations . . . . . . . . . . . . . . . . . . . 17
16. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
16.1. Normative References . . . . . . . . . . . . . . . . . . 17
16.2. Informative References . . . . . . . . . . . . . . . . . 18
Appendix A. Terms and Abbreviations . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 20
1. Introduction
Time synchronization is essential to Internet security as many
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