Get five different IT professionals to describe what cloud security means and you can expect five responses, which, taken independently, might all be right but also incomplete. Some concentrate on encryption, some on identity and access, and others on compliance. In fact, cloud security is not a practice at all; it encompasses everything in the realm of data protection, access control, network defense, and governance needed to keep resources secure in an environment the organization doesn’t completely own or control.
Understanding what is cloud security best practices are helps organizations recognize their broad scope and determine which responsibilities belong to the organization and which belong to the cloud provider.
A Working Definition
In its simplest form, cloud security is the policies, technologies and controls used to protect data, applications and infrastructure in cloud environments. That wide definition includes everything from encryption of data at rest to controlling who can log in to an admin console to inspecting network traffic for anything even remotely resembling a compromise. Underlying each of these practices is the indisputable fact that cloud resources do not reside in a building owned by the organization, and that significantly alters how each of these protections must be implemented and validated.
This presents a fundamentally different challenge than traditional on-premises security. If a server is suspected of being compromised, an organization can’t simply walk into the data center and check it out that server isn’t theirs to start with; it belongs not only to the cloud provider but may even be shared between multiple customers. The change of requiring organizations to think in a fundamentally different way about how they protect their assets means security in the cloud has to work through configuration, policy, and verification rather than physical control.
The Responsibility Question
The most important idea related to cloud security, and one that smacks organizations in the face like few others is the idea of shared responsibility for security between the cloud provider and customer. Providers are responsible for securing the underlying infrastructure- the physical facilities, network hardware and virtualization layers that make clouds possible. Controlling your public cloud exposure Customers are still responsible for what goes into that infrastructure—the data they store, the access policies they set and how they configure the services that consume their data.
The boundary between these two areas of responsibility is not always intuitive and shifts depending on the type of cloud service in use. A government technical reference architecture lays out exactly this kind of shared risk model. The federal cloud security architecture, developed jointly by multiple federal agencies, illustrates how organizations should think through shared risk during cloud adoption, and provides practical guidance on building and securely monitoring a cloud environment. The same underlying principles apply well beyond government use cases, since the core challenge of dividing responsibility sensibly is universal across any organization adopting cloud services.
The Real Problems Misunderstanding Responsibility Creates
The majority of cloud security incidents do not originate from a weakness in the cloud provider’s infrastructure. They are rooted in a decision made on the customer side, often either an incorrect configuration or an access policy that was too permissive (asserting some protection existed when instead it did not). It turns out this pattern is so evident across the industry that it has almost become a mantra among those in cloud security: the infrastructure itself is usually not the weak link, but how organizations configure and manage what sits on top of it often is.
This is why knowing about the shared responsibility model is not theoretical. A cloud consumer that operates on the belief their cloud provider owns a specific protection, because that protection was also always owned by the customer, effectively and without realizing it has left that area totally unprotected. The solution is not more technology. It is a lucid, recorded understanding of precisely where the duty line rests for every service that an organization uses.
Certification and Standardization Efforts
Because shared responsibility can be confusing to navigate consistently, several jurisdictions and standards bodies have developed clearer frameworks for evaluating cloud security commitments. Within the European Union, efforts have focused on harmonizing how cloud security gets certified and communicated across member states. The EU cloud certification scheme reflects this effort, aiming to provide organizations with a consistent way to evaluate and compare cloud providers’ security commitments, rather than relying on each provider’s own marketing claims or a patchwork of national certification schemes.
Events such as these are useful as they lessen the need for each individual organization to independently validate every single security allegation a cloud vendor places. Having a well-respected certification scheme provides customers with a benchmark that they can trust, allowing more time and focus for those aspects of cloud security that really require organizational thinking; such as determining what classification data is or how access policies translate into actual business roles.
Putting the Pieces Together
More than any one product or checklist, cloud security (when fully understood) is a continuous discipline of aligning the appropriate protections with the appropriate layer of responsibility and accountability. Things like encryption, identity management, network controls, and monitoring are of course important but none of them replace having a division of responsibilities for every specific cloud deployment.
Organizations that treat cloud security this way… as a continuous discipline of testing assumptions against responsibility boundaries, do better than those who consider it a one-off technology purchase. However, the cloud landscape is continuously evolving, new services are adopted and as a result responsibility boundaries can move around without notice. Returning to that knowledge again and again is as critical as having it figured out from the start.
Frequently Asked Questions
Who is responsible for cloud security? The cloud provider or the customer?
It is shared. Providers then secure the underlying infrastructure, but customers are still responsible for their data, access configuration, and how they use each service they adopt.
For what reason are cloud security incidents regularly been caused?
Relatively few of those flaws came from problems with the provider’s underlying infrastructure, and this is precisely why it’s so important to understand the shared responsibility model.
Why Should Organizations Care About Cloud Security Certification Schemes?
They provide customers with a firm, third-party-certified baseline for assessing provider security commitments instead of trusting the provider’s own assertions.
