Layered Cloud Security with AWS
Security on AWS is not a single technology or service. It is a series of reinforcing layers, each designed to catch what the layer above or below might miss. This section walks through each layer of a defense-in-depth architecture on AWS, from network boundaries to automated incident response.
The Five Security Layers​
| Layer | Focus | Key AWS Services |
|---|---|---|
| Network | Isolate and segment workloads | VPC, Security Groups, NACLs, VPC Endpoints |
| Identity (IAM) | Control who can do what | IAM, STS, Organizations, SSO |
| Data | Protect data at rest and in transit | KMS, S3 encryption, ACM, Secrets Manager |
| Application | Shield applications from external threats | WAF, Shield, API Gateway, Cognito |
| Detection & Response | Monitor, detect, and respond to threats | GuardDuty, CloudTrail, Config, Security Hub |
Learning Path​
- Defense in Depth: Security Layers on AWS - Understand why layered security matters
- IAM: The Identity Layer - The most critical layer, with Terraform examples
- Network Layer: VPC, Security Groups, and NACLs - Network isolation with Terraform
- Data Layer: Encryption and Access Controls - Encryption and key management with Terraform
- Application Layer: WAF, Shield, and API Security - Protect your application perimeter
- Detection and Response: GuardDuty, Config, and CloudTrail - Monitoring and threat detection
- Advanced IAM Patterns - Permission boundaries, SCPs, and ABAC (Premium)
- Security Automation and Compliance as Code - Automated remediation and compliance mapping (Premium)
- Incident Response Playbooks on AWS - IR lifecycle and forensics (Premium)
Free vs Premium Content​
All conceptual content and Terraform implementations are free. Every free page includes interactive flashcards for review.
Premium content includes:
- AWS CDK (TypeScript and Python) implementations
- CloudFormation templates
- Advanced multi-account security patterns
- Production-ready compliance frameworks and incident response playbooks
Start with the Security Layers Overview to understand the full picture before diving into individual layers.