Secure Enclaves, Explained: 5 Pillars of Enclave Cybersecurity

Cybersecurity used to be a simpler game: There was a clearly defined perimeter, whose walls were meant to safeguard the information inside, and keep it there. But that didn’t last long. Information is far less valuable when it’s inaccessible to those who need it — whether it’s partners, customers, systems, or even remote employees. Data sharing is imperative. 

For this reason, and many others, the cybersecurity perimeter has now dissolved. Data travels across clouds, endpoints, and third-party environments, rendering traditional castle-and-moat security strategies obsolete. For cybersecurity and compliance professionals, the challenge is no longer just keeping bad actors out; it is about protecting data while it is being used, processed, and shared.

Enter the secure enclave.

While the concept has roots in hardware engineering, it has evolved into a critical architectural strategy for meeting rigorous compliance frameworks like CMMC and GDPR. Here is what technology leaders need to know about secure enclaves, from technical definitions to the "build vs. buy" decision-making process.

What is a Secure Enclave?

At its core, what is a secure enclave?

In a broad architectural sense, a secure enclave is a segregated environment, physically or virtually isolated from the rest of a network, designed to protect sensitive data and code from unauthorized access, even if the surrounding infrastructure is compromised.

Technically, this can manifest in two ways:

1. Hardware-Based (Trusted Execution Environments): These are specific regions within a CPU (like Intel SGX or AWS Nitro Enclaves) where memory and execution are encrypted and isolated from the main operating system. Even a user with root access to the server cannot peer inside the enclave while data is being processed. Think of it like a bulletproof partitioned drive for storing sensitive information. 
2. Logical/Virtual Enclaves: This involves creating a segmented network environment (often used in compliance contexts) where sensitive data, such as Controlled Unclassified Information (CUI), is stored and processed in a protected, well-governed environment. In the context of CMMC compliance, for example, your enclave might be hosted on a FedRAMP authorized cloud, designated for CUI and closely governed with strict permissions at both the network and the data level. 

For those familiar with CMMC, you can map these two types of enclaves to the CMMC scoping guide’s “Physical Separation” and “Logical Separation” categories. Physical separation creates boundaries using hardware, and logical separation creates boundaries using software or network access.  

In this video, Virtru customer Solugen moved from a physical enclave to a cloud enclave to enable more seamless collaboration for CMMC compliance. They opted for Google Workspace CSE, using Virtru Private Keystore as their external key manager to ensure separation of encrypted Google content and private encryption keys. 

5 Pillars of Enclave Cyber Security

Enclave cyber security represents an opportunity to rethink the traditional network-centric protections. On its own, an enclave can become just another silo. But, with the right framework, an enclave can be an opportunity for stronger governance, protections, and entitlements that make secure data sharing seamless. Implementing an enclave strategy can improve your security posture through five main mechanisms:

1. "Protect Surface" Prioritization

Creating an enclave begs the question: “What goes in it?” Deciding which data assets are most important for you to protect will help you scope your enclave project and keep the assets inside more secure. Unless you’re in the intelligence community, you probably don’t need an enclave for everything.
Recommended Reading: Don Yeske’s Webinar on Federal Zero Trust: Why the Protect Surface Matters  

2. Strict Access Control

After answering, “What goes in the enclave,” the next question to address is, “What people or systems should have access?” Enclaves typically operate on a Zero Trust basis. Access is not granted based on network location or user role, but on cryptographic verification and strict policy adherence.

3. Attack Surface Reduction

By prioritizing the ”protect surface” and isolating sensitive workflows, you drastically reduce the number of pathways an attacker can use to reach your critical data. Meanwhile, you don’t waste valuable time trying to boil the ocean and securing every piece of data with the same controls, which reduces the effectiveness of your security strategy. 

4. Encryption in Use

Most security tools protect data at rest (storage) and in transit (network). Hardware-based secure enclaves protect data in use, meaning data remains encrypted in memory while the CPU processes it, but it can create barriers to data sharing with internal and external contacts, as it only protects information physically within that hardware.

5. Secure Sharing

An enclave is only as effective as its ability to meet your business needs with data availability, integrity, and confidentiality. If you don’t enable secure, simple sharing of enclave-hosted files, then the utility of those assets is greatly decreased. Enclave strategies must account for the business need to share information with the right entities, at the right time — internally and externally. If they do not account for sharing, then they are either rendered ineffective, or teams will circumvent the enclave in order to get their jobs none. Neither is a good solution. 

Where the Enclave Falls Short 

Enclaves are designed to be segregated environments, and by definition, they raise a key challenge: What happens when you need to share data in the enclave with someone outside your organization? 

This is where Virtru Collaborate delivers something that a traditional enclave can't. It provides a way to keep your data both protected and productive — a FedRAMP authorized, PCI-compliant workspace for secure file sharing that doesn't sacrifice control. With Virtru Collaborate, you and your contacts — internal and external — can collaborate confidently with granular policy and access controls for the data you share, all within an environment that supports the most stringent compliance standards such as CMMC, ITAR, CJIS, and GLBA. 

Here's how it works: 

The CMMC Secure Enclave Strategy

For defense contractors and the Defense Industrial Base (DIB) overall, the most urgent use case is the CMMC secure enclave. For most defense contractors, a cloud-based enclave is more practical for collaboration — it enables more flexible, dynamic sharing, with appropriate access permissions, to ensure that partners and customers can both send and receive CUI securely. 

Under CMMC 2.0 (Cybersecurity Maturity Model Certification), contractors must demonstrate adherence to NIST 800-171 standards to protect CUI. Applying these rigorous controls to an entire corporate enterprise is expensive, disruptive, and time-consuming.

A CMMC secure enclave strategy focuses on scope reduction: Instead of trying to raise every endpoint, device, and network to military-grade standards enterprise-wide, organizations can shift their CUI workflows into a dedicated secure enclave, with secure locations for information downloading and processing when needed. This segregates the regulated data from the unregulated corporate network. The result: You only need to audit and certify the enclave, not the entire enterprise, saving significant time and budget on compliance.

Here's Virtru customer, Solugen, describing how they use Virtru to protect encrypted CUI to support their CMMC strategy. Effectively, they use a designated instance of a FedRAMP authorized Google Drive enclave for CUI. 

Data Protection Inside and Outside the Enclave

Whether you are looking to utilize trusted execution environments for high-level computation or segregating a network to handle DoD contracts, the secure enclave is a valuable component of modern cyber resilience. Just as important as the storage, however, is the business use case: You'll want to ensure that your secure enclave enables you to easily share sensitive information with the right entities, at the right time, in a controlled way.

Virtru Collaborate allows you to protect each data object with end-to-end encryption and granular access control that moves with the data when it inevitably needs to travel outside the enclave — all powered by the Trusted Data Format (TDF). Hosted in a FedRAMP authorized environment, Virtru-protected files remain under the data owner's control at all times, without adding unnecessary friction to the collaboration process. 

Need to secure your sensitive data workflows, or prepare your organization for compliance requirements like CMMC? Discover how Virtru helps you protect data everywhere it flows: Book a demo with our team today.