Attack Scenarios and Security Analysis of a Blockchain and PUF-Based Lightweight Authentication Protocol for Wireless Medical Sensor Networks
Bibliographic record
Abstract
In Wireless Medical Sensor Networks (WMSNs) wearable or implantable sensors are used to collect vital body parameters, allowing remote monitoring and advanced predictive and preventive healthcare. This involves transmitting patients’ physiological data, which are sensitive and should be confidential, over the network. Thus, ensuring the security and privacy of these data is one of the most important prerequisites for the successful development of healthcare systems based on WMSN. In this regard, reliable authentication protocols designed for this specific scenario are needed. In this paper, we propose the most efficient attacks to date on the widely referenced lightweight authentication protocols for WMSNs - Wang et al.’s protocol (IEEE Internet of Things Journal, 9(11), 2022, doi: 10.1109/JIOT.2021.3117762). This protocol relies on blockchain and smart contracts to address the issue of centralization, and on Physically Unclonable Functions (PUFs) to ensure advanced physical layer security. Our attacks exploit the protocol’s vulnerabilities that stem from an inadequate use of the underlying blockchain component, unlike the previous attacks which require challenging conditions to meet, i.e. physical access to users’ mobile devices and specialized power analysis techniques. We introduce new attack scenarios and prove that Wang et al.’s protocol is vulnerable to impersonation, tracing, message replay and session key disclosure. We validate these vulnerabilities using the ProVerif tool, thereby confirming the feasibility of the attack scenarios and refuting Wang et al.’s claims regarding the protocol’s security properties. In addition, we identify and discuss other design weaknesses in Wang et al.’s proposal that further undermine its overall security and practical applicability. Finally, we revisit the feasibility of previously published attacks on Wang et al.’s protocol.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.006 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".