# What is Cloud Security Architecture?

> Cloud security architecture is the documented structure of security responsibilities, trust boundaries, components, data flows, and control decisions for a cloud-based system or portfolio.

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## Content

It translates protection needs into designs for identity, networks, workloads, applications, data, management planes, monitoring, resilience, and provider dependencies. It is an architectural description and decision model, not a product or generic checklist.

The architecture should describe both provider-operated and customer-operated elements across the chosen service and deployment models. It connects business consequences and data sensitivity to concrete enforcement points, administrative paths, cryptographic boundaries, telemetry, recovery mechanisms, and lifecycle processes. Reference patterns must be adapted to the system and contract.

### Key points

- **Scope and context:** Identify assets, services, dependencies, jurisdictions, threat assumptions, required data flows, availability needs, and the consequences of compromise or provider failure.
- **Trust and responsibility:** Show where identities, policy decisions, enforcement, keys, data, and administration cross organizational or technical boundaries, and assign an accountable owner for each control.
- **Assurance and evolution:** Record design decisions and exceptions, validate important properties, review provider and application changes, test recovery, and keep diagrams and threat models aligned with deployed infrastructure.
- **Important limitation:** An architecture diagram does not establish that controls exist, work, or remain correctly configured. Reference patterns can omit service-specific behavior, and a design that ignores operational ownership, observable evidence, failure modes, or application logic can create false confidence.

### Related terms

[Cloud security](<https://yellowcube.eu/glossary/cloud-security/>) · [Security architecture](<https://yellowcube.eu/glossary/security-architecture/>) · [Cloud network security](<https://yellowcube.eu/glossary/cloud-network-security/>) · [Zero trust architecture (ZTA)](<https://yellowcube.eu/glossary/zero-trust-architecture/>) · [Hybrid cloud security](<https://yellowcube.eu/glossary/hybrid-cloud-security/>)

### Sources

[CISA Cloud Security Technical Reference Architecture v2](https://www.cisa.gov/sites/default/files/2023-02/cloud_security_technical_reference_architecture_2.pdf) · [NIST SP 800-160 Vol. 1 Rev. 1: Engineering Trustworthy Secure Systems](https://csrc.nist.gov/pubs/sp/800/160/v1/r1/final) · [NIST SP 500-292: Cloud Computing Reference Architecture](https://www.nist.gov/publications/nist-cloud-computing-reference-architecture)

## Attribution and scope

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