Proving Performance: RF Attenuation Testing in SCIFs
With the growing threat of electronic eavesdropping and RF (radio frequency) emanations, ensuring the integrity of shielding in Sensitive Compartmented Information Facilities (SCIFs) has never been more critical. When constructing or purchasing a SCIF with TEMPEST and RF shielding requirements, how can you be confident it performs to the level required to protect national security interests? The truth is, the only way to know is through RF attenuation testing.
At Armag, we’ve seen firsthand that assumptions aren’t enough. Every Armag modular and transportable SCIF is rigorously tested to validate proper RF shielding before it leaves the factory. Thanks to our robust construction methods, we can confidently guarantee that Armag’s shielding performance will carry through to installation.
What is RF shielding and why is it important?
RF shielding or attenuation is the reduction and/or weakening of radio frequency (RF) signals passing through a structure – wall, door, window, etc. – similar to reducing the sound level that passes through. It is measured in decibels (dB); the higher dB value, the greater the signal reduction.
Electronic devices can emit unintended RF signals (emanations) that could contain sensitive or classified information. Adversaries with the proper equipment can intercept these signals from outside a facility lacking the proper protective measures. And, with the rapid growth of electronic devices and computing in the intelligence field, RF shielding is becoming critical to safeguarding sensitive and national security information.
What Are Your True Requirements?
Not all RF attenuation requirements are the same. Some missions require basic protection against incidental leakage, while others demand stringent safeguards to counter advanced surveillance threats.
Procurement teams and end users must work closely with accrediting officials and security officers to define:
- Required attenuation levels – what is your factor of safety?
- Frequency ranges of concern
- Threat environment (e.g., urban vs. remote)
- Mission duration and frequency of retesting
RF attenuation requirements are defined by the Accrediting Official (AO), often in coordination with a Certified TEMPEST Technical Authority (CTTA). These requirements often dictate the types of RF shielding materials and methodologies used in construction. Understanding the mission-specific requirements ensures the shielding solution is appropriate and effective.
Does Your SCIF Truly Meet RF Attenuation Requirements?
Far too often, SCIFs are delivered or constructed without validated proof of electromagnetic shielding performance. Whether the requirement is set by a standard such as NSA 94-106 or specific attenuation levels across key frequencies, many solutions claim compliance—but do they actually deliver?
The simple truth – shielding performance cannot be confirmed without testing of the final product.
Components that pass lab testing can perform differently once installed in the real world. Factors like construction tolerances, sealing failures, and installation errors can dramatically affect performance. A door that met 60 dB of attenuation in the lab may underperform in the field without proper installation. A well-built SCIF must demonstrate the required attenuation—not just claim it on paper.
The only way to ensure real-world effectiveness is through testing, typically using standards such as IEEE-299. If your SCIF isn’t tested—or isn’t tested to the correct standard—you may be operating with a false sense of security. Don’t mistake lab data for real-world results.
Shielding Performance Degrades Over Time
Even if a SCIF is properly constructed and tested at delivery, performance will degrade—especially at shielded doors, which are the most common failure point. Daily use, environmental exposure, and wear on gaskets, hinges, and latching systems all contribute to a decline in shielding effectiveness.
A door that met requirements on day one will degrade over time without proper upkeep. Without regular inspection and periodic retesting, these vulnerabilities can go undetected—leaving your facility exposed.
Maintaining RF shielding integrity requires a lifecycle approach:
- Initial testing at time of inception
- Ongoing visual and performance checks
- Scheduled retesting and maintenance
Conclusion
When shielding SCIFs, testing is not optional—it’s essential. Don’t assume performance. Verify it. Shielded components are only as effective as its installation, integration, and inspection. Lab results do not equal field results.
Armag Corporation delivers SCIFs that not only meet shielding standards on day one, but also support long-term protection through robust design, rigorous testing, precision fabrication, and durable components. Every Armag SCIF is delivered with a certified RF shielding test.
We encourage all buyers, integrators, and users to ask the hard questions:
- Has your SCIF been tested for RF attenuation?
- Do you have a sufficient safety factor to account for degradation?
- Do you have documentation proving compliance?
- When was your last performance check?
If you’re unsure, we’re here to help. When it comes to national security, performance can’t be assumed—it must be proven.
