Crypto-Agility Engineering
FEDLIN builds the cryptography your business depends on and keeps it changeable as the standards move: post-quantum signatures made to stay valid for decades, TLS and certificate hardening deployed across live systems. You don't have to assemble a stack of expensive vendors or work it out yourself. You own the requirement, FEDLIN does the engineering.
Free scan. No signup.
Engineered by Jeremiah Coakley, Principal Security Architect
What do you need engineered?
When You Need This
Four ways in. One engineering practice.
Whichever door you enter, the work is the same: FEDLIN engineers the cryptography, deploys it into your live systems, and keeps it changeable as the standards move.
Long-lived records
You sign documents, ledgers, or audit trails that have to stay verifiable for decades, longer than today’s signature algorithms are expected to hold.
Transport & certificates
Your TLS, certificate, and DNS posture needs to reach a modern floor and stay there as certificate lifetimes keep shrinking.
A post-quantum deadline
A customer security review, an auditor, a regulator, or a federal mandate is asking how you will move to quantum-resistant cryptography, on a date.
Getting ahead of it
You want the ability to change algorithms, keys, and certificates on demand, before the next deprecation forces a rebuild under deadline.
Delivered work
Engineered, deployed, and running today
FEDLIN does the cryptographic engineering, not just the advice. Two examples of work already live in production.
Post-quantum signatures, in production
A platform whose documents have to stay verifiable for decades needed signatures that survive the day a quantum computer can break today's cryptography. The plan was to license expensive vendors just to get that cryptographic foundation. FEDLIN engineered it instead: a post-quantum signing layer built into the product on the NIST hash-based standard, deployed to production. Those signatures are live today.
SPHINCS+ / SLH-DSA: NIST's post-quantum signature standard
TLS and certificate hardening, deployed and verified
Across a portfolio of live production domains, FEDLIN engineered and shipped the transport-layer security that is easy to half-configure and hard to get fully right: modern TLS version floors, HSTS, CAA records that control who can issue your certificates, and DNSSEC. Each control deployed, then verified with FEDLIN's own scanner. The fixes shipped and confirmed, end to end.
See the same scan on your own domain →Engagements
Two engineering planes. Quoted per engagement.
The right entry depends on where your cryptography needs work: the data crossing your network, or the records that have to outlast today's algorithms. Start with a scoping call. When you need to see what you run first, a Post-Quantum Readiness Assessment produces the inventory the engineering works from.
Transport-Layer Engineering
Quoted per engagement
For the data crossing your network
FEDLIN brings your TLS, certificate, and DNS posture to a modern floor and keeps it there as certificate lifetimes shrink. Each control is deployed into your live systems, then verified with an independent check you can re-run.
You keep the deployed configuration and the verification record, so an auditor or a customer can confirm the posture without taking your word for it.
Best for
- → Organizations that terminate TLS and manage their own certificates
- → Teams that need a modern transport floor actually deployed and verified
- → Anyone getting ahead of shrinking certificate lifetimes
What this delivers
- →Modern TLS version floors and cipher policy
- →HSTS and secure-transport response headers
- →CAA records governing who can issue your certificates
- →DNSSEC for authenticated DNS resolution
- →Certificate lifecycle as certificate lifetimes shrink
- →A before-and-after verification record, confirmed with FEDLIN's scanner
Records-Layer Engineering
Quoted per engagement
For data that must outlast today's algorithms
FEDLIN engineers the cryptography that keeps stored records verifiable for the long term: a post-quantum signing layer on the NIST hash-based standard, hybrid key establishment, and key management, on a FIPS 140-3 foundation, with crypto-agility built in.
The sharpest case is a record signed once and kept for decades: an on-chain entry, a legal hold, an audit trail, where you cannot reach back and re-sign it after the algorithm breaks.
Best for
- → Platforms that sign documents, ledgers, or audit trails with long retention
- → On-chain and distributed-ledger records that are permanent and public
- → Any application that signs records directly, rather than through a TLS stack
What this delivers
- →Post-quantum signatures (SLH-DSA, FIPS 205) for records that must stay valid for decades
- →Hybrid post-quantum key establishment (ML-KEM, FIPS 203) on a FIPS 140-3 foundation
- →FIPS 140-3 cryptographic modules beneath the data
- →Key management and crypto-agility, so algorithms change without re-engineering the system
- →Signature verification at read time, returned as a record you keep
Both engagements deliver
Is your TLS quantum-vulnerable?
Enter any public hostname to check its key exchange algorithm and certificate for post-quantum readiness.
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This scan covers your public TLS surface only. In-boundary endpoints, firmware, code dependencies, and your full cryptographic inventory require a dedicated assessment.
Where This Leads
One cryptographic program, entered where your risk is.
Crypto-agility engineering pairs with the assessment that scopes it and the edge hardening that extends it.
Post-Quantum Readiness
Facing a mandate with a date? Start with the assessment: a cryptographic inventory, a CNSA 2.0 mapping, and a sequenced migration roadmap.
Post-Quantum Readiness →Web & API Security
Extend transport hardening into full edge and API security: WAF rules, security headers, and domain trust, deployed and evidenced.
Web & API Security →Common questions
Have you actually built this, or do you just advise on it?
Built it. FEDLIN has engineered post-quantum signatures into a production platform made to keep signatures valid for decades, and deployed TLS and certificate hardening across live production domains. The work is delivered and running. FEDLIN can advise, but the core offering is the engineering itself.
What is crypto-agility?
Crypto-agility is the ability to change the cryptography your systems use (the algorithms, keys, and certificates) without re-engineering the systems around them. It matters because cryptography keeps changing: certificates expire faster, post-quantum standards are replacing today’s algorithms, and older schemes get deprecated. An agile setup lets you swap what is underneath on demand instead of rebuilding under deadline.
Is crypto-agility only about post-quantum?
No. Post-quantum migration is the largest current driver, but crypto-agility also covers the shrinking lifetimes of TLS certificates, long-lived signatures that must outlast today’s algorithms, FIPS-validated cryptography for regulated data, and the cryptographic identity your workloads use. FEDLIN engineers all of these as one practice.
How is this different from a one-time post-quantum assessment?
An assessment tells you where you stand once. Crypto-agility engineering builds the capability to keep changing as standards move: post-quantum deadlines, new certificate rules, and algorithm deprecations all arrive on their own schedules. FEDLIN can start with an assessment and then implement the changes it surfaces.
Often scoped together
Add related services to your scope
Post-Quantum Readiness
Inventory your live cryptography as a CycloneDX CBOM, map it to CNSA 2.0, and receive a sequenced migration roadmap.
Web & API Security
Edge and API hardening: TLS posture, security headers, and domain trust, deployed and evidenced.
Penetration Testing
Adversarial testing that validates cryptographic controls and key management boundaries.
The cryptographic engineering, delivered and running.
See where your transport security stands with FEDLIN's own scanner, free and no signup. When you're ready, book a scoping call to size the engineering.
From the Blog
From the field notes
Before the Algorithm: Where a Post-Quantum Plan Really Starts
The deadline lands and the instinct is to pick an algorithm. The plan actually starts a few phases earlier, and the hard part is the calls you make in the middle.
Taking Inventory: You Can't Migrate the Cryptography You Can't See
A federal mandate now requires agencies to inventory the cryptography they're running, with acquisition rules written to reach the contractors who serve them — and mandate or not, you can't migrate what you can't see. My FIPS 140-3 rebuild gave me a validated floor but didn't tell me what was standing on it, so I built the tool that takes the inventory — a secret-safe capture of a live system's cryptography with the CNSA 2.0 judgment on top — against my own cluster first, then for the estates that look nothing like it. It's the first deliverable of FEDLIN's Post-Quantum Readiness service.
What the 2030 Federal Encryption Deadline Means for Your Contracts
A June 2026 executive order set hard 2030 and 2031 deadlines for moving federal systems to quantum-resistant cryptography — with acquisition rules written to pull in the contractors who serve them. In plain terms: what it means, the move to make now, and the first steps to get ahead.
Not sure where to start? Tell us where you are.
Evaluating your security posture before a funding round, compliance deadline, or enterprise deal?