Plug-and-Play Quantum-Resistant BLE Pairing for Medical Implants via NFC Out-of-Band

2026-10-06

AI Summary

This study addresses the security challenges of Bluetooth Low Energy (BLE) pairing for implantable medical devices, which lack user interfaces and remain vulnerable to quantum computing attacks and near-field communication (NFC) eavesdropping in existing solutions. This work proposes a lightweight, plug-and-play protocol that introduces the first fully NFC-based post-quantum out-of-band (OOB) pairing scheme, leveraging key encapsulation mechanisms such as Kyber-1024 and FireSABER to ensure secure communication. The proposed approach requires no modifications to the BLE protocol stack or hardware alterations while providing robust protection against quantum threats, man-in-the-middle, and battery-draining attacks. Prototype evaluations demonstrate that the pairing process incurs less than 0.57% impact on device battery lifetime and significantly reduces radio-frequency exposure risks, making it highly suitable for resource-constrained scenarios.

Abstract

Bluetooth Low Energy (BLE) pairing establishes the cryptographic foundation for secure device communication. However, mainstream man-in-the-middle (MITM)-resistant pairing methods, such as Numeric Comparison and Passkey Entry, require user interfaces that implantable medical devices (IMDs) inherently lack, making Near-Field Communication (NFC)-assisted Out-of-Band (OOB) pairing an attractive alternative. Existing NFC-assisted OOB schemes authenticate a classical BLE key exchange that remains vulnerable to quantum attacks, while the NFC channel itself is susceptible to eavesdropping and active injection under stronger threat models. To address these limitations, we propose a lightweight, plug-and-play NFC-based OOB pairing protocol that performs a post-quantum key encapsulation mechanism (KEM) entirely over the NFC channel, ensuring that no shared secret is transmitted over NFC while reducing long-range radio-frequency (RF) exposure during pairing. The proposed protocol requires no modifications to the BLE stack and inherently resists RF battery-depletion attacks. Evaluation on an IMD-class proof-of-concept testbed demonstrates that post-quantum OOB pairing is practical on resource-constrained devices, reducing projected battery life by less than 0.57\% for Kyber-1024 and 0.56\% for FireSABER under an operational usage model relative to the MITM-vulnerable Just Works method.

Problem

• Implantable Medical Devices
• BLE Pairing
• Quantum-Resistant
• NFC Out-of-Band
• Man-in-the-Middle

Innovation

• Post-Quantum Key Encapsulation Mechanism
• NFC Out-of-Band Pairing
• Implantable Medical Devices
• Plug-and-Play Protocol
• Lightweight Cryptography