Encryption protects cloud data in particular states—such as while stored or moving across a network—but it does not decide who is allowed to use that data, stop a permitted account from abusing its access, detect every suspicious action, or restore lost services. Treat it as a foundational control, not a complete cloud-security strategy. Its effectiveness depends on identity controls, key governance, secure configuration, monitoring, recovery planning, and a clear division of responsibilities with each provider.
What encryption protects—and what it does not
Encryption at rest helps protect stored data if someone obtains access to the underlying storage. Encryption in transit helps protect data as it moves across networks. These controls address exposure of data in particular circumstances; neither is an access policy or a complete defense against misuse by an identity that is already authorized.
Encryption alone does not answer operational questions such as which people, applications, and services may access a resource; whether their privileges are excessive; whether a cloud setting has drifted into an unsafe state; whether unusual access is being logged and investigated; or how the organization will recover after deletion, ransomware, or a service disruption. CISA’s Cloud Security Technical Reference Architecture (June 2022) treats encryption alongside other measures, including access management, monitoring, resource separation, backups, and secure key management.
Data in use is a separate consideration: the cited guidance directly addresses encryption at rest and in transit, while protection of data during processing depends on the service and architecture. Do not assume that enabling storage encryption protects every stage of an application’s data lifecycle.
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Who controls the encryption keys?
Encryption is only useful to the extent that key access is governed appropriately. Confirm who creates, stores, administers, rotates, revokes, and can use each key—and what happens if the key is lost, compromised, or no longer available. A key arrangement that restricts provider access may also create customer duties for secure storage, availability, and recovery.
Server-side encryption
In server-side encryption, data are encrypted at their cloud destination. This can provide protection for stored data, but the customer should verify the service’s key-management options and who can access or administer the keys. The label alone does not establish the exact provider access model or operational safeguards; those vary by service and agreement.
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Client-side encryption
In the model described by CISA, the customer creates and retains a key without sharing it with the cloud provider, so the provider cannot view the stored data. This can be appropriate when keeping key control outside the provider is a requirement. It also means the organization must ensure that authorized applications and people can use the key when needed and that loss or revocation is handled deliberately. Client-side encryption does not by itself control account permissions, prevent all misuse, or guarantee availability.
Choose by requirements, not by label
NIST’s IR 7956 (2013) explains an enduring source of cloud key-management complexity: the consumer and provider may have different ownership and control of the key-management system and the protected resources. Because that report is older, use it for the architectural issue, not as a description of a particular provider’s current service. Compare the available arrangements against your security, operational, and recovery requirements, and confirm provider-specific details in current documentation and terms.
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Which controls must accompany encryption?
Identity and access
Use individual identities rather than shared accounts where practical, require suitable authentication—including multi-factor authentication (MFA)—and grant only the permissions each person, workload, or application needs. Review roles and permissions as responsibilities change, and account for both human and non-human identities. NIST’s Cybersecurity Framework 1.1 Quick Start Guide and SP 800-210 (2020) address access management while recognizing that requirements differ across IaaS, PaaS, and SaaS.
Network location should not be treated as proof of trust. NIST’s SP 800-207A (2023) states: “One of the basic tenets of zero trust is to remove the implicit trust in users, services, and devices based only on their network location, affiliation, and ownership.” Authentication and authorization therefore remain important even when data are encrypted.
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Configuration and separation
Restrict unnecessary exposure, separate resources to reduce the chance of inadvertent disclosure, and govern configuration changes. Review unused or unsupported cloud regions and services rather than assuming that encryption compensates for an exposed or misconfigured resource.
Logging and monitoring
Keep useful audit records, centralize them where appropriate, and monitor for unexpected access, configuration changes, and data flows. Decide who reviews alerts and how an investigation proceeds. Encryption may limit what an unauthorized party can read, but it does not itself identify suspicious activity or provide an incident-response process.
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Backups and recovery
Maintain backups suited to the threats and dependencies in your environment, then test that they can be restored. Exercise incident and recovery plans so teams know how to regain access to data and services, including when a key or cloud region is unavailable. CISA specifically highlights backup testing and monitoring cloud regions as additional data-protection measures.
Data lifecycle and exit
Track protection and access from data creation through storage, use, sharing, movement, and retirement. Establish what happens when data or accounts are deleted and when a cloud service ends, including how the provider handles sanitization or makes deleted data inaccessible. Confirm data portability and the dependencies that could affect a safe exit.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What changes across IaaS, PaaS, SaaS, and multi-cloud?
There is no single customer/provider responsibility split for every cloud deployment. In general, the service model changes which layers the provider operates and which settings or identities the customer must manage; the exact boundary is provider- and service-specific. A customer using SaaS, for example, should not assume the same control surface as one operating IaaS resources. Use the provider’s current responsibility documentation and contract to identify who handles each control.
For every service, document who is responsible for data sharing, keys, identity configuration, logging, backups, incident response, and service termination. Revisit the allocation when the service, architecture, or agreement changes. NIST SP 800-210 discusses access control across service models, while CISA’s architecture offers broader guidance on cloud controls.
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Quick Recap
A practical review checklist
- Identities: Are human, workload, and application identities accounted for, authenticated appropriately, and limited to necessary permissions? Are access and role assignments reviewed?
- Keys: Who creates, stores, uses, rotates, and revokes keys? Can the provider access them under the selected arrangement? Is key loss or compromise covered by a recovery process?
- Configuration: Are exposed resources limited, resources separated appropriately, and changes governed? Are unused regions or services reviewed?
- Visibility: Which events are logged, where are records retained, who monitors them, and how are alerts investigated across providers?
- Recovery and exit: Are backups tested, recovery plans exercised, and data deletion, portability, and service termination handled explicitly?
- Responsibilities: For each IaaS, PaaS, SaaS, or multi-cloud service, is it documented what the provider supplies and what the customer configures or operates?
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