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AWS Security - Section Introduction

Security isn't just a side topic on the DVA-C02 exam—it carries a massive 26% domain weighting (Content Domain 2: Security). Mastering the interplay between serverless compute like AWS Lambda and core encryption engines is how you crush the test and build bulletproof cloud architectures in the real world.

Here is a roadmap of the heavy-hitting security mechanisms we are locking down in this section, chief:

Key Takeaways​

                               ┌────────────────────────────────────────────────────────┐
                               │             AWS SECURITY ARCHITECTURE                  │
                               └───────────────────────────┬────────────────────────────┘
                                                           │
             ┌─────────────────────────────────────────────┼─────────────────────────────────────────────┐
             ▼                                             ▼                                             ▼
🔑 AWS KMS (Key Mgmt Service)                  📦 Secrets Manager & Parameter Store            🔐 Data Protection & Lambda
  • Envelope Encryption (DEKs)                  • SSM Parameter Store (Free/Standard vs. Adv)  • Server-Side Encryption (SSE-S3, SSE-KMS)
  • AWS Managed vs. CMK Keys                    • Secrets Manager (Auto-Rotation via Lambda)   • Encrypting Lambda Env Variables
  • Symmetric vs. Asymmetric KMS                • SecureString Parameter vs. Secret            • Client-Side Encryption (AWS Encryption SDK)

🔑 AWS Key Management Service (KMS) & Envelope Encryption​

  • Customer Managed Keys (CMK) vs. AWS Managed Keys: Knowing when to create your own key (for cross-account sharing, key rotation control, and key policies) versus using the default aws/s3 or aws/lambda keys.
  • Envelope Encryption ✉️: The core mechanics of calling GenerateDataKey. You use a KMS Plaintext Data Key to encrypt your heavy data payload locally, drop the plaintext key from memory immediately, and store the Encrypted Data Key alongside your ciphertext!
  • KMS API Calls for Devs: Mastering GenerateDataKey, Encrypt, Decrypt, and ReEncrypt within the AWS SDK.

🗄️ Secrets Management: SSM Parameter Store vs. AWS Secrets Manager​

Choosing the right storage medium for database passwords, API tokens, and connection strings is a constant exam target:

  • AWS Systems Manager Parameter Store: Ideal for plain text parameters or encrypted configuration parameters (SecureString backed by KMS). Low cost, integrated with CloudFormation dynamic references.
  • AWS Secrets Manager: Built specifically for sensitive credentials. Features native automated rotation using pre-configured AWS Lambda functions (e.g., rotating RDS database passwords every 30 days without app downtime).

⚡ Hands-On Security Integrations with AWS Lambda​

  • Environment Variable Encryption 🔒: Default Lambda environment variables are encrypted at rest using an AWS-managed KMS key. For strict compliance, using KMS Helper Keys (Customer Managed Keys) to encrypt sensitive variables at the application level before or during deployment.
  • Least-Privilege Execution Roles: Ensuring your Lambda execution roles carry exact, scoped IAM policies targeting KMS key usage (kms:Decrypt, kms:GenerateDataKey) and Parameter Store/Secrets Manager endpoints.