Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Comments on proposed HRP enhancements by NXP and DW] Date Submitted: [10 July 2018] Source: Dr. Boris Danev (3db Access), Dr. David Barras (3db Access), Prof. Dr. Srdjan Capkun (ETH Zurich) Re: [Changes proposal for the HRP UWB PHY] Abstract: [Comments on the proposed HRP enhancements by NXP and DW] Purpose: [802.15.4z] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

ToC Fundamental questions

Fundamental questions (1/2) 07/12/10 Fundamental questions (1/2) What is the security concept behind using the Cipher Sequence & Scrambled Timestamp Sequence (STS)? What is the verification method in the proposals? What are the assumptions on the HRP frame? How does one compute and set the thresholds? What are the false positives vs. false negatives?

Fundamental questions (2/2) 07/12/10 Fundamental questions (2/2) What is the level of protection achieved by the mandatory Cipher Sequence and STS in terms of numbers of equivalent bits? (under the HRP frame assumptions) Under which threat model is this level of protection analyzed? What is the hard problem to solve (“hardness assumption”) by an attacker? What is the total communication overhead to establish a secure distance measurement?

Q & A