Cloud Security Architecture

Cloud Security Architecture is a practical engineering guide to building defensible systems in AWS, Azure, and GCP. It starts from a single observation: security in the cloud is an architectural property, not a set of tools bolted onto an application. The tools matter, but they matter far less than the design decisions they are protecting. The book walks through the full stack — the case for treating security as architecture, zero trust principles and how to actually implement them, identity as the control plane, network segmentation and egress control, data protection and key management, secrets management, workload identity and service-to-service authentication, policy as code and guardrails, threat detection and response, supply chain security with SBOMs and Sigstore, compliance frameworks and evidence automation, incident response in the cloud, and security observability. It covers the failure modes that quietly wreck cloud security: a long-lived access key that ends up in a public repository, a service account with wildcard permissions that no one reviews, an encryption key stored in the same place as the data it protects, a compliance control that is documented but not implemented, a security alert that fires ten thousand times a day and is ignored. Each is presented with the failure, the countermeasure, and the operational tradeoff. Fourteen chapters. Real IAM policies, Kubernetes manifests, OPA rules, and Sigstore commands. Written for security engineers, platform engineers, and architects responsible for making cloud environments defensible.