Every FortressGuard engagement applies our CASTLE™ methodology to the operational realities, risk tolerance, and security objectives of your environment. What changes is the depth of assessment, level of validation, and ongoing support.
Scope is tailored by site count, asset criticality, architecture complexity, and authorized assessment activities.
01SEE
OT Recon
02ESTABLISH
OT Foundations
03VALIDATE
OT Fortified
04SUSTAIN
OT Stronghold
CHOOSE YOUR STARTING POINT
Four Levels of OT Security
You do not need to choose a tier before speaking with us. These engagement levels show how FortressGuard scales from initial discovery to continuous OT cybersecurity assurance.
TIER 1
CASTLE™ · SEE
OT Recon
See what needs attention first.
A focused look at your OT environment designed to uncover critical assets, connectivity, exposure, and the risks that deserve immediate attention.
Best for
Organizations that need an initial view of their OT security posture before committing to a deeper assessment.
Focus Areas
OT asset and connectivity discovery
High-level network and remote-access review
Architecture and exposure review
Exposure and vulnerability triage using approved evidence and passive discovery where authorized.
Priority risk identification
You walk away withYour highest-priority OT risks, ranked and explained.
TIER 2
CORE BASELINE
CASTLE™ · ESTABLISH
OT Foundations
Build a defensible baseline.
Establish a documented understanding of your OT assets, architecture, vulnerabilities, access paths, security gaps, and the improvements that should come next.
Best for
Organizations establishing or maturing their first structured OT cybersecurity baseline.
Everything in Recon, plus
Full asset inventory
Documented network and dataflow mapping
Remote-access review
Initial IEC 62443 zones and conduits
Validated vulnerability assessment
Security gap identification
Compensating-control recommendations
You walk away withA documented OT security baseline and prioritized remediation roadmap.
TIER 3
CASTLE™ · VALIDATE
OT Fortified
Validate the risk. Strengthen the environment.
A deeper assessment for organizations that need defensible risk analysis, control validation, and stronger evidence for leadership, customers, auditors, or insurers.
Best for
Higher-risk environments, regulatory requirements, audit pressure, or established OT security programs that need deeper validation.
Everything in Foundations, plus
Full IEC 62443 zones-and-conduits model
IEC 62443-3-2 cyber risk assessment
Exposure and attack-path analysis
Control-effectiveness validation
Designed compensating controls
Framework and control mapping aligned to applicable requirements.
Tabletop exercise
Executive and board-ready reporting
You walk away withA validated OT risk model and actionable security improvement plan.
TIER 4
CASTLE™ · SUSTAIN
OT Stronghold
Turn assessment into continuous assurance.
Stronghold extends OT security beyond a point-in-time assessment with ongoing visibility, validation, remediation support, and executive reporting.
Best for
Organizations that need sustained OT cybersecurity oversight without building an entire internal OT security program.
Everything in Fortified, plus
Continuous asset and exposure visibility
Maintained architecture and zones/conduits
Recurring risk assessment
Ongoing control validation
Compensating-control governance and implementation support.
Remediation support
OT-safe security validation
Compliance evidence support
Quarterly executive reporting
Annual reassessment
You walk away withAn OT security program that stays current as your environment changes.
WHAT YOU KEEP
Useful Evidence. Not Just Another Report.
FortressGuard assessments leave your team with practical artifacts that support remediation, engineering decisions, leadership discussions, and future security work.
01
OT Asset & Connectivity Inventory
A documented view of assets identified within the agreed assessment scope.
02
Architecture, Data Flows & Security Boundaries
Visual documentation of OT architecture, communication paths, and appropriate security boundaries.
03
Operationally Prioritized Risk Register
Findings ranked by operational relevance, exposure, likelihood, and potential consequence.
04
Phased Remediation Roadmap
Clear priorities, recommendations, and compensating controls for systems that cannot simply be patched or replaced.
05
Executive Decision Brief
Technical findings translated into operational and business decisions leadership can act on.
06
Scope, Assumptions & Evidence Record
A clear record of what was assessed, the evidence supporting conclusions, and items outside the agreed scope.
BUILT AROUND YOUR ENVIRONMENT
Need Something More Specific?
Not every OT environment fits neatly into a tier. Specialized capabilities can be added or scoped independently based on your objectives and operational constraints.
Turn Your OT Environment Into a Defensible Stronghold.
Bring us the systems, changes, concerns, or requirements on your mind. We will help you turn them into clear priorities and a plan built for how you operate.