Chris Engelbert 
If you run workloads for a federal agency, a defense contractor, or a regulated industry like healthcare or finance, “FIPS compliant storage” eventually shows up on a security review checklist. It is one of those requirements that sounds simple until you try to prove it, and storage is usually the layer where teams get stuck. This guide explains what FIPS compliant storage actually means in 2026, the distinction that trips most people up, and the practical ways to get there without sacrificing performance or operational independence.
What “FIPS Compliant Storage” Actually Means
FIPS 140 is a series of U.S. federal standards published by NIST that define security requirements for cryptographic modules: the hardware or software components that perform encryption, decryption, key management, and random number generation. When someone asks for FIPS compliant storage, they are really asking whether the encryption protecting your data at rest, and sometimes in transit, is performed by a cryptographic module that meets FIPS 140 requirements.
An important nuance is that FIPS 140 does not certify an entire storage system. It certifies the cryptographic module inside it: a defined boundary that performs the crypto. So “FIPS compliant storage” is shorthand for “storage whose encryption is handled by FIPS-conformant cryptography,” typically AES-256 for data at rest. For a deeper primer, see our glossary entry on FIPS 140-2 and FIPS 140-3.
FIPS also defines four security levels. Level 1 covers software-only cryptography, Level 2 adds tamper-evidence, and Levels 3 and 4 add escalating physical protection. Most software storage encryption targets Level 1 or Level 2, which is the right scope for the great majority of regulated Kubernetes and private-cloud deployments.
FIPS-Compliant vs FIPS-Validated: The Distinction That Matters
This is the single most important thing to understand before a procurement conversation, because the two terms are not interchangeable.
- FIPS-compliant means the system uses only FIPS-approved algorithms, such as AES-256-GCM and SHA-256, implemented correctly. It signals the right cryptography is in use.
- FIPS-validated means a specific cryptographic module implementation has gone through NIST’s Cryptographic Module Validation Program (CMVP) and holds a certificate with a number you can look up.
The gap between them is real. A vendor can legitimately say “FIPS-compliant” while using FIPS-validated algorithm implementations, and that is often exactly what a regulated team needs. But if your authorization to operate explicitly requires a CMVP certificate for the module, you must ask for the validated status and the certificate number, not a general compliance claim. The table later in this guide reflects that distinction, and the honest answer for any storage vendor is to be precise about which one they offer.
| Term | What it guarantees | When you need it |
|---|---|---|
| FIPS-compliant | Uses FIPS-approved algorithms (AES-256, SHA-256) implemented correctly | Most regulated deployments where approved cryptography is the requirement |
| FIPS-validated | A specific module holds a NIST CMVP certificate | Programs whose authorization explicitly mandates a validated module |
Where Storage Gets Stuck in a FIPS Posture
Teams often satisfy FIPS at the application and network layers and then discover the storage layer is the piece that cannot pass review. A few recurring reasons:
- Cloud dependency. Public cloud block storage handles FIPS at the provider level, which is convenient until you have to run on-premises, in a private cloud, or in an air-gapped environment where there is no provider to lean on. Then the responsibility for validated encryption is yours.
- Encryption as a bolt-on. Legacy storage often adds encryption as a separate layer on top of the data path, which eats into the performance of modern NVMe drives and forces a choice between compliance and speed.
- Missing audit trail. Security reviews want storage-level access logs and fine-grained access control. Many storage stacks treat these as out of scope, leaving compliance teams to assemble evidence from multiple layers.
- Disconnected operations. Storage software that phones home to a cloud control plane simply cannot run in classified or air-gapped networks.
🚀 Need storage that passes a FIPS security review on your own infrastructure? simplyblock delivers AES-256 encryption at rest with FIPS-validated algorithms in a self-hosted, air-gap-capable, NVMe-first block storage platform. 👉 See FIPS compliant Kubernetes block storage
How to Get FIPS Compliant Storage in Kubernetes and Private Cloud
There are a few practical paths to FIPS compliant storage outside the public cloud, and they trade off differently on performance, operational independence, and how much of the compliance burden you carry yourself.
| Approach | FIPS-conformant encryption | Self-hosted / air-gap | NVMe performance | Kubernetes-native |
|---|---|---|---|---|
| Public cloud managed storage | ✅ Provider-handled | ❌ Cloud dependency | ⚠️ Varies | ⚠️ Partial |
| Legacy SAN / appliance | ✅ Often validated | ⚠️ Heavy, costly | ❌ Encryption bolt-on | ❌ No |
| DIY (LUKS + open-source storage) | ⚠️ You own validation | ✅ Yes | ⚠️ Tuning required | ⚠️ Partial |
| simplyblock | ✅ AES-256, FIPS-validated algorithms | ✅ Yes | ✅ In the data path | ✅ Yes |
simplyblock is built for the self-hosted, regulated case. It encrypts all persistent volumes at rest using AES-256 with FIPS-validated algorithm implementations, and it runs that encryption natively in the storage data path rather than as a layer bolted on top, so compliance does not cost you the low latency of NVMe. It is fully self-hosted, with no external control plane and no call-home requirement, which makes it suitable for air-gapped, classified, and sovereignty-sensitive environments. For the broader picture, see how this fits edge and air-gapped storage and private cloud deployments.
Just as important for an audit, storage access is governed through Kubernetes RBAC and CSI-level volume policies, with per-volume key management and access logging, so security teams get the evidence they need without building a separate logging layer. As a certified Red Hat® OpenShift® partner, simplyblock applies the same encryption-at-rest guarantees in OpenShift as in upstream Kubernetes. On current certification status for a specific program, the right move is always to ask the vendor for exact validated-module details rather than rely on a compliance label, and simplyblock supports that conversation directly.
Questions and Answers
What is the difference between FIPS-compliant and FIPS-validated storage? FIPS-compliant means the storage uses FIPS-approved algorithms such as AES-256 implemented correctly. FIPS-validated means a specific cryptographic module holds a NIST CMVP certificate. Most regulated deployments need approved cryptography and correct implementation, which simplyblock provides through AES-256 with FIPS-validated algorithm implementations. If your authorization to operate explicitly requires a CMVP certificate for the module, ask the vendor for the validated status and certificate number rather than accepting a general compliance claim.
Does FIPS compliant storage hurt performance? It does when encryption is bolted on as a separate layer, which is common with legacy storage. simplyblock avoids that by running AES-256 encryption natively in the NVMe data path, so you keep the low-latency, high-throughput characteristics of the underlying hardware while meeting encryption-at-rest requirements. Compliance and NVMe performance do not have to be a trade-off.
Can I get FIPS compliant storage without a public cloud? Yes, and many regulated teams must. Public cloud handles FIPS at the provider level, but on-premises, private-cloud, and air-gapped deployments need self-hosted storage with validated encryption that you control. simplyblock runs entirely on your own infrastructure with no cloud control plane, which is what makes it viable for air-gapped and classified environments.
What FIPS level do I need for storage? Most software storage encryption targets FIPS 140 Level 1 or Level 2, which covers software-only cryptography and tamper-evidence respectively. Levels 3 and 4 add physical protections that are usually relevant to hardware security modules, not software-defined storage. The level you need is dictated by your specific authorization requirements, so confirm it with your compliance authority before evaluating products.
Does FIPS compliant storage help with data sovereignty too? Often yes. The same properties that make storage FIPS-ready, self-hosted operation, encryption you control, and no external control plane, also support data sovereignty by keeping data and key management on infrastructure under your jurisdiction. Teams pursuing sovereign or air-gapped architectures frequently get FIPS-conformant encryption and sovereignty from the same self-hosted storage decision.
