What Is Cloud Security?
Cloud security is the collection of technologies, controls, policies, and processes that protect the data, applications, and infrastructure that organizations deploy in IaaS, PaaS, and SaaS models. Its fundamental difference from traditional data center security is the disappearance of physical boundaries and the sharing of responsibility between the cloud provider and the customer.
The Shared Responsibility Model
The most commonly misunderstood aspect of cloud security is who bears responsibility for what. Providers such as Microsoft Azure, AWS, or Google Cloud are responsible for the physical security of the data center, network infrastructure, and platform integrity. However, data protection, identity management, access control, and application security are the customer's responsibility.
| Layer | IaaS | PaaS | SaaS |
|---|---|---|---|
| Physical infrastructure | Provider | Provider | Provider |
| Operating system | Customer | Provider | Provider |
| Application | Customer | Customer | Provider |
| Data | Customer | Customer | Customer |
| Identity and access | Customer | Customer | Customer |
Major Risks in Cloud Environments
Misconfiguration
The most common cause of security breaches in cloud environments is the misconfiguration of storage buckets or virtual machines. A publicly exposed Azure Blob Storage container or AWS S3 bucket can lead to the leak of millions of records.
Identity and Access Issues
Managing access to cloud resources for a large number of user and service accounts creates a complex privilege management challenge. Overly broad permissions or the absence of multi-factor authentication (MFA) carry significant risks.
Data Leakage
Sensitive data stored without encryption, insecure API endpoints, or poorly configured SaaS applications leave the door open to data leakage.
API Security
Cloud services communicate with each other via APIs. Insecure API endpoints, authorization gaps, and poor management of API keys create critical vulnerabilities.
Essential Cloud Security Controls
Identity and Access Management (IAM)
In line with the principle of least privilege, every user and service account should be granted only the permissions it needs. MFA must be mandatory for all users.
Encryption
Data must be encrypted both at rest and in transit. Encryption keys should be managed by the customer (BYOK — Bring Your Own Key) or controlled by the organization.
CSPM (Cloud Security Posture Management)
Tools that continuously assess the security posture of the cloud environment. They automatically report misconfigurations, compliance gaps, and risk scores.
CASB (Cloud Access Security Broker)
Monitors enterprise users' access to cloud applications, enforces DLP policies, and makes shadow IT usage visible.
Security Logging and Monitoring
All activities in the cloud environment must be logged, and these logs must be integrated with a SIEM to detect anomalies.
Security in Hybrid and Multi-Cloud Environments
A significant portion of organizations operate hybrid architectures that combine on-premise data centers with cloud environments. In these setups, consistently enforcing security policies across both sides represents a major challenge.
In multi-cloud scenarios, each provider's own security tools and configuration models make centralized visibility and management more difficult. Unified security management tools help address this complexity.
KVKK and Cloud Compliance
Under KVKK, the transfer of personal data abroad is subject to specific conditions. Hosting databases containing personal data in a cloud region in Europe or the United States requires careful attention from a legal standpoint for companies operating in Turkey. Providers such as Microsoft Azure offer data residency options for Turkey.
Conclusion
Cloud security goes beyond the misconception that "my cloud provider handles everything" — it requires a proper understanding of shared responsibility and the effective implementation of organization-specific controls. As NRC Sistem, we assess the security posture of your cloud infrastructure, jointly design IAM configuration, encryption, CSPM, and monitoring processes, and support your implementation.