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Legacy Devices & Patchwork

OT Test Benching Proposals

Legacy Devices & Patchwork

We provide required healing for OT–IT convergence & Digital Transformation through our expertise in Instrumentation, Data Acquisition & Embedded Systems. Our focus: buyback & refurbishment of legacy assets, “secure wrapper” designs for unpatchable devices, and structured software patchwork aligned to plant uptime.

Legacy Device Buyback & Assessment

Inventory & classify PLCs, RTUs, drives, HMIs & gateways. Electrical/firmware health check, spares viability, EOL/EOS risk rating, and retrofit path to Purdue L1–L3. Deliverables: BOM, risk heatmap, and retrofit ROI.

Software Patchwork & Hardening

Vendor patch validation on test bench, change windows, rollback plans, and golden images. Compensating controls for unpatchable devices: allow-lists, protocol mediation, logging, and backup/restore runbooks.

Secure Wrapper for Unpatchables

Apply “virtual air-gap” using network cloaking + Zero Trust Network Access (ZTNA), passwordless MFA, and microsegmentation. Result: devices are undiscoverable externally, yet safely reachable for authorized workflows.

How our Legacy Patchwork Program works

· Asset ingest (make/model/firmware), criticality, protocols, ports. · Spin up representative test cells (Purdue L0–L3.5) to validate vendor patches and compensating controls.

· Implement network cloaking to hide unpatchable devices from AI‑powered reconnaissance. · Add passwordless MFA, peer‑to‑peer ZTNA, and microsegmentation for least privilege access.

· Define freeze periods, backout steps, and golden images. · Auto‑update clients; orchestrated firmware order: Client → Orchestrator → Gateways/Agents.

· Runbooks, evidence packs, and OT‑IT handover. · Ongoing egress policies, policy reviews, and vendor patch cadence.

Network Cloaking for Unpatchables

Hide exposed services/ports so legacy assets are undiscoverable to scanners and AI recon tools—creating a “virtual air-gap” while keeping authorized maintenance online.

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Passwordless MFA (Phishing-Resistant)

Remove passwords entirely; authenticate with device-bound credentials (Authenticator/FIDO2) to stop credential theft and replay on remote access flows.

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Peer-to-Peer ZTNA & Microsegmentation

Granular access to only the required asset/workflow. Segment contractors, OEMs, and operators to minimum necessary privileges per job ticket.

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Lifecycle Upgrades & Auto-Updates

Client auto-updates; orchestrated firmware upgrades from a central console. Version pinning and staged rollouts to protect uptime.

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Change-Safe Patch Windows

Plan freeze periods, backups, and fallbacks; execute and verify with evidence packs for audits.

Compliance Ready

Map controls to NIST/IEC 62443 change management; preserve chain-of-custody for firmware and configuration artifacts.

Scope Program tiers	Site Assessment	POC / per cell Retrofit	Per / one‑time Secure Wrapper	Annual / program Lifecycle+
Bench Validation
Secure Wrapper (Cloak + ZTNA)
Patch Window & Rollback
Firmware Upgrade Orchestration
Evidence Packs & Handover
	Request Checklist	Get Proposal	Book Pilot	Enroll

What clients ask

FAQs for OT Patchwork & Legacy Wrappers

From refinery skids to water treatment plants and ports—clients ask similar questions when upgrading legacy fleets without downtime. Here are quick answers.

What if my device is unpatchable?Answer

We apply a “secure wrapper”: network cloaking to hide the asset, then ZTNA with passwordless MFA for authorized maintenance. This creates a virtual air‑gap without breaking workflows.

How do you schedule patches safely?Answer

We validate patches on a bench, prepare backouts and golden images, and execute during agreed windows. Clients auto‑update, and firmware is upgraded in a safe sequence.

What changes for remote vendors / OEMs?Answer

They use phishing‑resistant MFA (Authenticator app or FIDO2 key) and receive microsegmented, job‑ticket‑bound access only.

Do you support ongoing policy tuning?Answer

Yes—we maintain egress policies, review segments, and refresh evidence packs for audits and regulatory requests.

Legacy Devices & Patchwork