Zero-Trust Architecture for Point-of-Care Diagnostics
POCT devices must simultaneously be internet-connected for LIMS sync and accessible to non-IT clinical staff, making them high-value targets. This paper details the BiQadx Zero-Trust LIMS architecture and its defence-in-depth posture.
Healthcare network breaches have increased 93% in three years (HIPAA Journal, 2025). POCT devices historically operate on flat network segments with implicit trust — a critical vulnerability. Our threat model identified three primary attack vectors: (i) USB-based malware injection during calibration procedures, (ii) rogue access point injection into instrument Wi-Fi profiles, and (iii) unencrypted HL7 message interception on hospital LAN segments.
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Zero-Trust Implementation Stack
The BiQadx LIMS Intelligence Node implements a multi-layer isolation model. At the hardware layer, a TPM 2.0 chip enforces boot integrity verification and provides a hardware root of trust. Network traffic uses mutual TLS 1.3 with certificate pinning — instruments reject any certificate not matching the BiQadx CA chain, regardless of local network trust. Patient data is AES-256 encrypted at rest using per-patient key derivation (PBKDF2-HMAC-SHA512) before disk write.
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AI-Driven Self-Healing & Incident Response
The LIMS node incorporates a local 'Sandboxed Watchdog' that monitors system calls for anomalous behavior patterns. If a P1 security event is detected, the instrument automatically severs all external network connectivity within 120ms, purges transient encryption keys from RAM, and enters a minimal-functional 'Secure Off-grid' mode — allowing the current diagnostic test to complete while protecting the broader network.
◆ Security Control Verification Matrix
Control Layer
Standard
BiQadx Implementation
Status
Boot Integrity
NIST SP 800-147
TPM 2.0 Secure Boot + kernel hash chain
✓ Verified
Data at Rest
FIPS 140-2
AES-256-GCM with PBKDF2 key derivation
✓ Verified
Data in Transit
TLS 1.3 RFC 8446
Mutual TLS with BiQadx CA pinning
✓ Verified
API Authentication
OAuth 2.0 / PKCE
Short-lived JWT (15-min expiry) + refresh
✓ Verified
Device Identity
IEEE 802.1AR
Per-device X.509 certificate + CRL check
In Progress
Independent security audit by ClearSpec Cybersecurity GmbH. Report: BQ-SEC-AUDIT-2026-001.BiQadx Engineering Data
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Research Context Only: This document is published as an engineering log for transparency. All content describes R&D-phase investigations. No clinical diagnostic claims are made. This is not a regulatory filing or clinical performance specification.
