What Is Cloud Security?
Cloud security refers to the technologies, policies, controls, and services that protect cloud data, applications, and infrastructure from cyber threats. It encompasses the protection of data at rest, in transit, and in use, as well as the safeguarding of virtual resources and the underlying physical infrastructure.
- What Is Cloud Security?
- Core Security Layers
- 1. Physical Security
- 2. Network Security
- 3. Infrastructure Security
- 4. Data Security
- 5. Application Security
- 6. Identity & Access Management (IAM)
- Key Security Controls
- Common Threats in the Cloud
- Cloud Security Maturity Model
- Shared Responsibility in Cloud Security
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Core Security Layers
1. Physical Security
Data centers are protected by biometric access, surveillance cameras, and environmental controls that guard against power loss, fire, and natural disasters.
2. Network Security
Firewalls, intrusion detection/prevention systems, and virtual private networks (VPNs) restrict and monitor traffic between cloud services and users.
3. Infrastructure Security
Virtual machines, containers, and hypervisors are hardened, patched, and monitored for anomalous behavior.
4. Data Security
Encryption at rest and in transit, tokenization, and key management services ensure that data remains confidential and tamper‑proof.
5. Application Security
Secure coding practices, runtime application self‑protection (RASP), and web application firewalls (WAFs) shield applications from injection, XSS, and other attacks.
6. Identity & Access Management (IAM)
Role‑based access control (RBAC), multi‑factor authentication (MFA), and identity federation limit who can view or modify cloud resources.
Key Security Controls
- Encryption Key Management – centralizes key creation, rotation, and revocation.
- Zero Trust Architecture – verifies every access request regardless of origin.
- Security Information and Event Management (SIEM) – aggregates logs for real‑time threat detection.
- Continuous Compliance – automates policy checks against standards such as ISO 27001, SOC 2, and GDPR.
Common Threats in the Cloud
- Misconfiguration – the most frequent cause of data exposure.
- Account Hijacking – compromised credentials used to launch attacks.
- Data Leakage – accidental exposure of sensitive data via insecure APIs or storage buckets.
- Malware in Virtual Environments – ransomware that targets virtual machines or containers.
Cloud Security Maturity Model
| Stage | Focus | Typical Controls |
|---|---|---|
| Initial | Basic protection, reactive response | Manual backups, ad hoc firewalls |
| Managed | Policy‑driven, automated monitoring | IAM policies, SIEM, encryption |
| Defined | Integrated security across services | Zero Trust, continuous compliance, shared responsibility frameworks |
| Optimized | Proactive threat hunting, predictive analytics | AI‑driven detection, threat intelligence feeds |
Shared Responsibility in Cloud Security
Cloud providers secure the "under‑the‑cloud" infrastructure: physical data centers, network fabric, and hypervisors. Customers are responsible for securing data, identities, applications, and configurations within the cloud environment they manage.