Yes. CUI documents can be scanned locally without uploading their contents to a cloud service, provided the scanning software and computing environment are appropriate for the information and satisfy applicable security requirements.
But "offline" can mean several different things.
A tool might process documents locally while still contacting a licensing server. Another might work without internet access after installation. A third might require no network connection at any stage.
These are materially different architectures.
What does offline document scanning mean?
At its simplest, offline scanning means that document inspection occurs on the user's device rather than on a remote server.
For example, a local scanner can:
- Open a PDF or Word document.
- Extract supported text and document structures.
- Evaluate the extracted content against detection rules.
- Display findings locally.
- Finish without transmitting the document to an external service.
Whether the scanner itself makes network requests is a separate question.
An organization should distinguish between:
- Local processing: Document contents are analyzed on the device.
- Offline operation: The application can complete a scan without connectivity.
- Air-gapped deployment: The application operates in a deliberately isolated environment with approved installation, update, and licensing procedures.
One does not automatically establish the others.
Why does this matter for CUI?
CUI requires safeguards determined by applicable laws, regulations, government-wide policy, and agency or contractual requirements.
That does not mean every CUI document must be handled on an air-gapped computer.
It does mean that organizations must understand where the document is processed, where it is stored, and which systems or services can access it.
A scanner that uploads documents for analysis introduces a different data flow from a scanner that inspects them within the existing authorized environment.
Neither architecture is automatically compliant. Authorization and safeguarding requirements still apply.
What should an offline scanner support?
A disconnected deployment should be evaluated against practical requirements:
Local processing. The detection engine and necessary document parsers must execute inside the permitted environment.
Offline licensing. Scans should not require an online license check if the system is expected to operate without connectivity.
Offline installation. Required binaries, dependencies, and updates must be transferable through approved procedures.
Transparent network behavior. The vendor should document any licensing, analytics, update, or diagnostic connections.
Supported files. The scanner should clearly identify which file types and document elements it examines.
Local findings. Results and any temporary processing artifacts should remain under the controls of the authorized environment.
Where Strike Gate fits
Strike Gate is designed around local document inspection.
Strike Gate's CLI can scan supported files locally without runtime network access. For an air-gapped deployment, build it and acquire all dependencies before transferring approved artifacts into the isolated environment. Verify the exact build and license behavior under your organization's procedures.
The web app, browser extension, and Office add-in are separate network-dependent access methods: they require hosted assets or browser installation and update flows. Their local scanning behavior does not make those interfaces disconnected. Check the current network behavior for each method before choosing a deployment.
Before using any tool with CUI
Confirm that:
- The device and application are permitted for the information.
- Required organizational approvals have been obtained.
- The software does not create unauthorized transfers.
- Its supported file types and limitations are understood.
- Security personnel have approved the workflow where required.
Offline capability is a technical property. Authorization to handle CUI is a separate organizational requirement.