HELP: Helper-Enabled In-Band Device Pairing…
summary
Proposes HELP primitive that lets a trusted helper inject random on‑slots so a hub detects signal cancellation and message injection, complements Diffie‑Hellman to prevent MitM without preloaded secrets, and implements the protocol on a USRP testbed (cancellation emulated in MATLAB). Experiments show attackers can achieve ~90% BPSK cancellation in lab but HELP drives adversary success toward negligible as helper on‑slots increase, and random power/time offsets defeat simple inference.
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chapters (16)
- 0:00Introduction
- 0:27Problem Statement
- 1:15Trust Establishment Problem
- 1:52Problem Setup
- 2:47Threat Model
- 3:50Existing Solutions
- 6:06InBand Verification
- 9:13Contribution
- 10:07How does HELP work
- 11:35Device Pairing Protocol
- 13:37Maninthemiddle Attack
- 16:52Experiments
- 19:04Helper Detection Based on Time
- 20:05Protocol Evaluation
- 21:10Conclusion
- 23:58Questions
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