DoD Cloud Security Requirements: How to Secure Cloud Adoption

The DoD cloud security model, codified in the Cloud Computing Security Requirements Guide (CC SRG), establishes baseline security requirements to protect sensitive data and mission-critical systems in cloud environments. Organizations adopting cloud computing for Department of Defense operations must comply with these standards to ensure operational integrity, safeguard critical information, and support secure cloud deployment.

This blog provides an overview of the key SRG requirements and practical steps for aligning your cloud environment with DoD expectations. Following the DoD cloud security model not only ensures compliance but also strengthens your organization’s ability to safely leverage cloud services while maintaining the security of mission-critical operations.

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What Is the DoD Cloud Computing Security Requirements Guide (SRG)?

The CC SRG builds on the Federal Risk and Authorization Management Program (FedRAMP) Moderate baseline, incorporating additional DoD-specific security enhancements (FedRAMP+) to mitigate insider threats and advanced persistent threats.

CSPs must also follow DoD Security Technical Implementation Guides (STIGs) and provide dedicated infrastructure for Impact Levels 4 and above, ensuring that DoD data remains protected in cloud environments.

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3 Key Security Objectives of the DoD SRG

1. Confidentiality: Ensuring that sensitive DoD data is protected from unauthorized access.
2. Integrity: Maintaining the accuracy and reliability of data to prevent unauthorized modifications.
3. Availability: Ensuring mission-critical systems remain accessible when needed.

DoD SRG vs. FedRAMP

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DoD Cloud Computing Strategy and Evolution

The DoD has steadily evolved its cloud approach to modernize IT infrastructure, improve efficiency, and secure mission-critical data. The foundation of this effort was the DoD Cloud Computing Strategy (2012), which emphasized consolidating data centers, standardizing IT services, and enabling scalable cloud capabilities across the department.

A central element of this strategy is the Joint Information Environment (JIE), which unifies networks, services, and cybersecurity policies across all military branches. Linking cloud adoption to the JIE helps reduce duplication, simplify management, and enhance interoperability while maintaining strict security standards.

Key Initiatives Include:

• Data center consolidation: Hundreds of legacy facilities were closed or repurposed, with workloads migrated to fewer, more secure, and efficient environments.
• Enterprise Cloud Environment (ECE) vision: A flexible, shared cloud infrastructure designed to support rapid application deployment, automated provisioning, and standardized services for all DoD missions.

Over the past decade, the DoD’s cloud strategy has shifted from planning to practical implementation. By connecting historical strategies like the 2012 plan with ongoing modernization, the department has established a clear path toward a cloud-first, secure enterprise environment.

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Understanding DoD impact levels (IL2, IL4, IL5, IL6)

The impact level (IL) framework in the DoD Security Requirements Guide categorizes cloud environments according to the sensitivity of the data they store and process.

It follows CNSSI 1253 and the FedRAMP Moderate Baseline, ensuring that all levels maintain at least moderate confidentiality and integrity.

IL1 – Publicly Releasable Information

IL1 applies to publicly releasable information that does not present meaningful security risks. Because these workloads do not require specialized protections, IL1 is rarely implemented, with most DoD cloud operations beginning at higher impact levels.

IL2 – Low-Sensitivity Unclassified Data

IL2 is used for data cleared for public release as well as some private unclassified DoD information. It requires basic access controls, minimal encryption, and standard monitoring to safeguard low-sensitivity workloads while enabling efficient cloud deployment.

IL4 – Controlled Unclassified Information (CUI)

IL4 covers Controlled Unclassified Information (CUI) and other noncritical mission data. It is the level most commonly used by defense industrial base contractors handling sensitive, but unclassified, information. IL4 allows workloads to be hosted on shared or dedicated infrastructure depending on the sensitivity of the data and requires moderate encryption, audit logging, and robust access controls.

IL5 – Mission-Critical and Sensitive Data

IL5 builds on the protections of IL4 and adds stricter security measures for mission-critical and highly sensitive data. IL5 certification—formally called Provisional Authorization at Impact Level 5—requires cloud service providers to use dedicated infrastructure, employ only U.S. citizens, and implement over 421 security controls.

Workloads at IL5 demand continuous monitoring, advanced encryption, and enhanced access controls to protect against potential attacks, making this level suitable for sensitive operations across DoD organizations.

IL6 – Classified Information

IL6 represents the highest impact level, designed for classified information up to the secret level. It requires a dedicated cloud enclave connected to the Secret Internet Protocol Router Network (SIPRNet) and enforces the strictest technical, physical, and personnel security measures to protect national security data and support critical mission operations.

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Authorization Process for Commercial CSPs Under the DoD SRG

CSPs must receive a provisional authorization from the Defense Information Systems Agency (DISA) to operate under the DoD SRG. There are three ways a CSP can be evaluated for a DoD PA:

1. FedRAMP Joint Authorization Board (JAB) PA: CSPs that have already obtained or are in the process of obtaining a FedRAMP JAB provisional authorization can use this as a foundation for DoD authorization.
2. Federal agency authorization: If a CSP has received authorization from a federal agency, with security controls assessed by a certified Third Party Assessment Organization (3PAO), it may apply for a DoD provisional authorization.
3. DoD self-assessed PA: In this case, DISA’s cloud assessment team conducts an independent evaluation of the CSP, separate from FedRAMP.

Challenges and Solutions in Meeting DoD SRG Requirements

• Challenge: CSPs must implement additional safeguards beyond FedRAMP baselines, including NIST SP 800-53 controls and DoD-specific requirements not covered by standard frameworks.
• Solution: By integrating DoD-specific security controls into existing FedRAMP processes, CSPs can align with SRG expectations without duplicating efforts. Regular control mapping, automated compliance monitoring, and continuous auditing help ensure adherence while reducing manual workload.

• Challenge: IL5 mandates dedicated infrastructure, physically isolated from non-DoD tenants, which adds complexity and operational costs.
• Solution: CSPs can deploy dedicated data centers or logically isolated environments with strict access controls. Leveraging virtualization, containerization, and network segmentation can maintain security while optimizing infrastructure costs.

• Challenge: Handling IL4/IL5 data requires rigorous personnel screening, including U.S. citizenship and background checks.
• Solution: Establish structured hiring practices that prioritize eligible candidates and integrate thorough background verification and security training. Regular audits and clear documentation streamline compliance and reduce administrative burden.

These requirements make achieving a DoD PA a complex and resource-intensive process, but they are necessary to ensure the security of DoD missions and classified data in cloud environments.

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5 Security Controls to Implement for DoD-Compliant Cloud Adoption

1. Encryption

Organizations should implement FIPS 140-2 validated encryption for both data-at-rest and in-transit. It’s also crucial to destroy encryption keys during data spills and ensure data is restored from clean backups to maintain data integrity and security.

Depending on the circumstances, you may also want to implement symmetric and asymmetric encryption.

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2. Access Controls

Zero trust architecture (ZTA) plays a critical role in the DoD’s cloud security strategy. This model helps ensure the integrity of the system by assuming that no device, user, or system should be trusted by default.

Key aspects include:

• Enforce strong access control: ZTA principles require rigorous access verification at every point, even for users inside the network. Multi-factor authentication (MFA) is a core component, ensuring that access requests are properly authenticated and secure.
• Continuous monitoring: ZTA mandates continuous monitoring and validation of all access requests, ensuring that no unauthorized access occurs. It supports continuous risk assessment, which aligns with DoD’s need for constant vigilance over cloud resources.

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3. Monitoring

The FedRAMP continuous monitoring strategy and the DoD Risk Management Framework (RMF) serve as the cornerstones of continuous monitoring.

To implement effective real-time security monitoring, organizations should:

• Establish organization-defined metrics: These metrics help track and assess security controls and overall compliance.
• Define monitoring frequencies and assessments: Organizations must establish a clear schedule for monitoring, ensuring consistency.
• Follow the continuous monitoring plan: Regular assessments should align with the organization’s predefined monitoring strategy to maintain security.
• Hire and finance a Mission CND (MCND): This ensures the protection of apps, systems, and virtual networks within the IaaS/PaaS infrastructure of any CSP.
• Use an assured compliance assessment solution (ACAS): Implement scanning and ensure all security standards are continuously verified.

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4. Supply Chain Risk Management

Supply chain risk management (SCRM) is integral to the DoD’s cloud security requirements. To ensure supply chain integrity, organizations must develop a comprehensive SCRM plan that includes an anti-counterfeit strategy.

To align with SRG guidelines and ensure vendor compliance, organizations should:

• Conduct vendor assessments: Evaluate suppliers using frameworks like NIST SP 800-161 to identify risks in hardware, software, and services.
• Implement cybersecurity standards: Require vendors to adhere to CMMC and FIPS-compliant encryption protocols.
• Enforce contractual obligations: Include clauses mandating secure development practices and incident reporting in contracts.
• Leverage continuous monitoring: Use security information and event management (SIEM) tools for real-time threat detection across the supply chain.
• Collaborate on threat intelligence: Engage in programs like the Defense Industrial Base Collaborative Information Sharing Environment (DCISE) to exchange information on emerging threats.

5. Incident Response

Organizations must coordinate incident response and threat intelligence sharing across CSPs, CND entities, and mission owners to defend DoD systems. This shared responsibility ensures quick detection, reporting, and mitigation of security threats.

To comply with FedRAMP and DoD guidelines, organizations need an incident response plan addendum that addresses integration and data breaches. This addendum should meet SRG reporting requirements and be reviewed by DISA.

Incident reporting obligations under the SRG include:

• Incident reporting to MCND: CSPs must report incidents to the MCND, which coordinates with the BCND as necessary.
• Initial incident reports: These must be submitted within one hour of discovery, with follow-up information provided as it becomes available.
• US-CERT reporting lexicon: Reports should align with the reporting standards established by US-CERT.
• Incident response plan or addendum: CSPs must provide a plan or addendum addressing data breaches and ensuring government notification.
• Incident reporting for dedicated DoD infrastructure: Incidents must be reported directly to the DoD.
• Incident reporting in multi-tenant environments: Incidents must be reported to both US-CERT and the DoD.

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Securing Cloud Adoption for DoD Compliance

GRSee Consulting can help your organization navigate the complex requirements of secure cloud adoption in the DoD. Adhering to the stringent guidelines outlined in the CC SRG and DoD SRG is essential. By implementing robust security controls such as encryption, access controls, continuous monitoring, and incident response protocols, organizations can ensure they meet these standards.

This approach not only safeguards sensitive data but also aligns with the overall security strategy for supporting DoD missions and maintaining operational integrity.

» Ready to navigate DoD cloud authorization? Schedule a compliance assessment to map your path from current state to Provisional Authorization