Data Security Engineering · Critical Infrastructure
Secure the links your infrastructure runs on.
We find where your encryption lives and who can reach in, fix what can change, and document what can't, with evidence your assessor will accept.
Who we serve
NERC CIP · OT/ICS
Critical infrastructure
Encryption and access findings on remote sites and systems you can't replace. We fix what can change and document the compensating controls for what can't.
See critical infrastructure security →Teaming & partnerships
Partner with us
We work behind the firm that holds the client relationship: scoped, fixed-price work you can mark up and deliver under your name.
See how we partner →Government contractors: see our Capability Statement →
Partners & VerificationsAnthropic Cyber Verification · Vanta MSP · Google Cloud Partner · Red Hat Partner
What we engineer
Find it, fix it, or document why you can't.
We close the findings your scanner or assessor names, and where a system cannot change, we document the exception with compensating controls. The program builds the rest around that: identity, the edge, your workloads, and the AI you run, on the systems you already own, with the evidence wired into your compliance platform and checked against what it actually reports.
Scanner flagged it?
Fix the encryption findings
Weak TLS, certificates, and ciphers, closed under your scanner's own finding names, plus the "when you can't fix it" path.
See Vulnerability Remediation →Where the inventory leads
GRC Engineering
Your full control program, engineered inside your systems and kept audit-ready, starting from the cryptographic findings.
See the program →Building with sensitive data?
Keep it in your boundary
Web apps, MCP servers, and private AI built and secured inside your own systems, with the evidence to show it.
See what we build →The evidence
The Risk Register, yours to keep.
The Cryptographic Readiness Report is what you hand over. The Risk Register is what you keep: every finding ranked by how long the data it protects has to stay secret, costed, and mapped to the frameworks you answer to. Each one carries a recommended treatment (remediate, mitigate, or accept), and the decision stays with the owner you name. Where legacy or OT hardware can't run modern encryption, as in NERC CIP environments, the accept path comes with the compensating-control documentation your assessor expects. One remediation clears every framework it maps to, and each finding scopes what comes next. The action plan stays yours whether or not the work continues with us.
Every row: finding, surface, severity, business impact, frameworks satisfied, recommended treatment and owner, remediation and effort, the program it routes to, and status.
Start with where your encryption lives.
PQC Readiness finds it and maps it into your Risk Register. Everything after is scoped from what it shows.
Advisor, MSP, or agency? You keep the client and the relationship. We're the engineering arm, findings to you first. See the partner program →
Don't take our word for it
See where yours lives, free.
Run it on your own site and see what an assessor, an auditor, or a customer review would see in your encryption. No signup.
Unable to scan
Email these results to yourself
FEDLIN receives a copy and may follow up.
Check your inbox.
This scan covers your public TLS surface only. In-boundary endpoints, firmware, code dependencies, and your full cryptographic inventory require a dedicated assessment.
scan_post_quantumathttps://mcp.fedlin.com/mcpFrom the Blog
Latest field notes
Anthropic's Critical Infrastructure Defense Program and the Remediation Backlog
On October 8, Anthropic launched its Cyber Mission and a program that brings frontier AI to the firms defending power, water, and transportation systems. Your clients are about to see more vulnerabilities, faster. The firms that hold those contracts will need the capacity to fix them, and to document the ones that can't be fixed.
Compensating Controls for Legacy Systems: Accepting Cryptographic Risk With Evidence
A scanner flagged weak encryption on a system you can't change: an old gateway, a terminal, an appliance past vendor support. Here is how to treat the finding, which compensating controls carry weight, and how to write the record an assessor can accept.
DKIM 1024 vs 2048: Upgrading Your Key Without Breaking Mail
A scanner or a customer's security review flagged your DKIM key as too short. It's a cryptography finding with a clean fix, and the rotation can happen without a single message bouncing.
Frequently Asked Questions
What does working with FEDLIN look like?
Engagements start with a scoping call about your architecture and the review in front of you: a NERC CIP audit, an encryption or remote-access finding, a customer security review, or a federal contract requirement. From there the work is a build. We measure what your buyer requires, engineer the fixes, and hand you the evidence that clears it.
Does FEDLIN do architecture or engineering?
Both, by design. Every engagement starts with the architecture decision (which controls, where, and why) before anything is built. The design and the build are complementary and can be delivered on their own or together.
We don't have a security team. Can FEDLIN run the whole program?
That's a common place to be as you grow. FEDLIN builds your control program as a scoped project, then keeps it running on a monthly retainer sized to what's at stake: the controls, the evidence wired into your GRC platform, and the program that clears the review and keeps it clear.
What does NERC CIP require when a security patch can't be applied?
CIP-007 R2 requires you to evaluate released security patches for applicability at least once every 35 calendar days. For each applicable patch, within 35 days of that evaluation, you apply it, create a dated mitigation plan, or revise an existing one, and then carry out the plan in the timeframe it sets. FEDLIN fixes what the system can take and writes the mitigation and compensating-control records for what it can't, with the evidence your CIP auditor reviews.
Is it safe to use AI tools on OT systems?
It can be, with the controls already used for people and vendors. Joint CISA guidance from December 2025 centers on human oversight of critical decisions and fail-safe design. In practice that means verified people, scoped and logged access for each agent, analysis kept off the control network, and a human approving every change to a running system. That is how FEDLIN works on OT engagements.
What does OMB M-26-15 mean for federal contractors?
OMB M-26-15 directs federal civilian agencies to inventory their cryptography and plan the move to NIST's post-quantum algorithms (ML-KEM, ML-DSA, and SLH-DSA). Contractors feel it through what agencies ask of them: an inventory of the cryptography in the systems you run for them, a migration plan, and post-quantum support written into product and contract requirements. Executive Order 14412 separately directs a proposed FAR rule that would extend NIST's post-quantum standards to covered contractors, so the contractors who build the inventory now are ahead of the FAR rule. FEDLIN produces that inventory for the systems in scope and sequences the migration from it, delivered through your prime or integrator.
How do you secure remote and vendor access into OT?
Every remote and vendor access path into the control network gets mapped, including the cellular and satellite links that backhaul remote sites. For high- and medium-impact BES Cyber Systems, the paths are engineered to NERC CIP-005 R2 and R3: an Intermediate System, encryption and multi-factor authentication on interactive remote access, and the ability to see and end active vendor sessions, with an evidence package your auditor can follow. Paths that can't change get a risk-acceptance record with compensating controls, and work inside an Electronic Security Perimeter runs through your team or integrator.
What's the relationship between NIST CSF and NIST 800-53?
NIST CSF is the framework designed for communication. It gives founders, executives, and non-technical stakeholders a clear language for security posture across five functions: Identify, Protect, Detect, Respond, Recover. NIST 800-53 is the technical control catalog underneath it, the specific controls that implement what CSF describes. FEDLIN assesses and builds to both. Every major framework, including SOC 2 and PCI DSS, maps back to this foundation.
What does principal-led mean in practice?
You work directly with the principal security architect, the person who owns the architecture, the engagement, and the build. Delivery draws on a vetted partner network where scope requires it: penetration testing, specialized infrastructure work, or govtech contracting.
Do you work with integrators, MSPs, or fractional advisors?
Integrators, MSPs, and fractional advisors bring FEDLIN in for the specialist work their clients need and can't keep on staff: cryptographic readiness, OT remote access, vulnerability backlogs on legacy systems, and edge and identity hardening. You keep the client, the relationship, and the advisory lead. FEDLIN does the engineering, findings to you first. See the partner program for how this works.