How do I encrypt data at rest and in transit in AWS?

 

Quick Insight

Encryption in AWS isn’t complicated—but it does require intentional design. AWS gives you the tools to encrypt data both at rest and in transit. The real challenge isn’t flipping the switch—it’s enforcing encryption consistently across accounts, services, and workloads.

Why This Matters

Data is your most valuable asset, and regulators treat its protection as non-negotiable. A breach where unencrypted data is exposed is not just a technical failure—it’s a business crisis. Encrypting data at rest and in transit is one of the clearest signals to customers, regulators, and boards that your enterprise takes security seriously. And in AWS, it’s the baseline for compliance frameworks from PCI DSS to HIPAA to BIS standards.

Here’s How We Think Through This

  1. Encryption at Rest

    • S3 Buckets: Enable server-side encryption (SSE-S3 or SSE-KMS) for all objects. Make encryption the default.

    • EBS Volumes: Use EBS encryption for block storage. Tie it to AWS Key Management Service (KMS).

    • RDS & DynamoDB: Enable encryption at creation. If unencrypted instances exist, migrate to encrypted ones.

    • AWS KMS: Centralize key management. Use customer-managed CMKs for sensitive data. Rotate keys regularly.

  2. Encryption in Transit

    • TLS Everywhere: Enforce HTTPS (TLS 1.2+) for all endpoints, APIs, and load balancers.

    • AWS Certificate Manager (ACM): Simplify SSL/TLS certificate provisioning and renewal.

    • Service-to-Service Traffic: Use TLS for connections between applications, and enable encryption in services like Amazon MQ or MSK.

    • VPN & Direct Connect: Encrypt traffic between on-premises and AWS.

  3. Governance & Automation

    • Apply AWS Config rules to detect unencrypted resources.

    • Use Security Hub to benchmark against compliance standards.

    • Automate remediation where possible (e.g., block uploads to unencrypted S3 buckets).

What Is Often Seen in Cybersecurity

We see recurring issues across enterprises:

  • Buckets without default encryption—teams assume it’s on by default, but it isn’t.

  • Mix of encrypted and unencrypted EBS volumes—creating gaps attackers can exploit.

  • Certificates expired or unmanaged—leaving services vulnerable to interception.

  • Keys without rotation—long-lived keys increase risk of misuse.

Enterprises that get it right standardize encryption policies and automate enforcement. They don’t rely on teams to “remember” to enable encryption—they make it impossible not to.

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