Building a Secure Enclave: On-Prem File Sharing for CMMC Compliance

For small to mid-sized manufacturing companies, protecting sensitive information isn’t just about preventing theft—it’s about complying with regulations that can make or break your business. The Cybersecurity Maturity Model Certification (CMMC) is one such requirement, especially for defense contractors working with the Department of Defense (DoD). Achieving CMMC compliance demands robust security measures, including how you handle file sharing within your organization.

Understanding the Need for a Secure On-Prem File Sharing System

Many manufacturing firms rely on shared network drives or basic cloud solutions. While these may seem sufficient, they often lack the granular security controls mandated by CMMC Level 3 and above. These controls include:

• Access Control: You need to ensure only authorized personnel can view or edit sensitive files.

• Audit Trails: You must track who accessed or modified files and when.

• Data Encryption: Sensitive data should be protected both at rest and in transit.

On-premises solutions—where your data stays within your own facility—offer the highest level of control. They reduce dependency on external providers, eliminate concerns about data sovereignty, and can be tailored precisely to your compliance needs.

Key Components of a Secure On-Prem File Sharing Enclave

Creating a secure enclave isn't just about installing a server; it's about integrating multiple security layers that work together seamlessly. Here are the core components:

1. Dedicated Secure Storage

Invest in a server or storage array with built-in security features, such as hardware encryption modules. Ensure that access to this storage requires authentication, and consider setting up separate storage for different security levels.

2. Role-Based Access Control (RBAC)

Limit file access based on job roles. For example, your assembly line managers might have access to production schedules, but not HR files. Implement strict permissions to prevent accidental or malicious leaks.

3. Network Segmentation

Segment your network so that sensitive data is isolated and only accessible through secure, monitored pathways. Use VLANs or physical separation where feasible.

4. Authentication and Authorization

Use strong, multi-factor authentication (MFA) for access to your enclave. Regularly review user permissions to catch any drift from least-privilege principles.

5. Encryption

• At Rest: Encrypt stored files, especially those containing sensitive CUI (Controlled Unclassified Information).

• In Transit: Use secure protocols (like SFTP, HTTPS, or VPNs) for file transfers.

6. Audit and Monitoring

Implement tools that log file accesses, modifications, and transfers. Regular audits can help spot anomalies before they become breaches. Consider solutions compatible with CMMC audit requirements.

Steps to Build Your On-Prem Security Enclave

1. Assess Your Needs: Identify what data must be protected and who needs access.

2. Select Appropriate Hardware and Software: Enterprise-grade storage, a secure file server, and security tools.

3. Design Your Network Architecture: Segment sensitive data and control access pathways.

4. Implement Security Controls: Set permissions, enable encryption, configure MFA, and set up monitoring.

5. Test Your System: Conduct regular vulnerability scans and access reviews.

6. Document and Train: Keep records for CMMC compliance and train staff on security best practices.

Benefits of an On-Prem Secure Enclave

• Enhanced Security: Full control over who accesses your files and how they are protected.

• CMMC Compliance: Meets specific cybersecurity requirements necessary for defense contracts.

• Data Sovereignty: Your data stays within your control, reducing external risks.

• Customizability: Tailor the system to your operational workflows and regulatory needs.

Real-World Example: Small Manufacturer Implements On-Prem File Sharing

Consider a mid-sized manufacturer producing defense components. They faced challenges with their previous cloud-sharing setup which lacked proper audit trails and access controls. By deploying a dedicated on-premises server with strict user roles, network segmentation, and encrypted storage, they achieved CMMC Level 3 compliance. The new setup provided them with complete oversight of data access, improved data security, and peace of mind during audits.

Conclusion: Keep Your Data Secure, Your Business Compliant

Building a secure enclave for on-prem file sharing isn't just a technical task—it's a strategic move to protect your business and meet regulatory demands. Focus on core security principles: control, encryption, auditability, and continuous monitoring. With these in place, your manufacturing firm can confidently handle sensitive data and stay compliant with CMMC standards.

For more guidance on building secure systems and achieving CMMC compliance, visit resources like the CMMC Accreditation Body or speak with cybersecurity professionals experienced with manufacturing and defense contracting.