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AWS Security Best Practices

Relax. We'll talk through this in plain words — no textbook voice.

What you'll walk away with

  • Understand AWS Security Best Practices without any of the intimidation
  • Get comfortable running things yourself in the AWS CLI/Console
  • Be ready to apply this concept in a real project right away

Let's think about this for a second

The AWS Shared Responsibility Model splits security into 'security OF the cloud' (data center physical security, hardware — AWS's responsibility) and 'security IN the cloud' (data encryption, access control, patching your guest OS — the customer's responsibility) — you can't just ignore the customer side of things. You should have both Encryption at Rest (data encrypted on disk) and Encryption in Transit (data encrypted as it travels the network, HTTPS/TLS) enabled in production. Layer a Security Group (EC2 level, stateful — once a request is allowed, the response is auto-allowed) together with a Network ACL (subnet level, stateless — inbound and outbound must each be explicitly allowed) and you get defense-in-depth.

Let's connect this to a real scenario

If you enable the 'Enable encryption' checkbox when creating an RDS database, it encrypts the data on disk (Encryption at Rest) — connect from your application to the database using an SSL/TLS connection string and you get Encryption in Transit too. In a production VPC, keep your Security Group (instance level) tight, and use a Network ACL (subnet level) as an additional layer to block suspicious IP ranges.

Let's look at this together

text
AWS Well-Architected Security checklist (summary):

[ ] MFA enabled on root user and all IAM users with console access
[ ] IAM least-privilege policies (no wildcard * unless truly needed)
[ ] Encryption at rest enabled on S3/RDS/EBS
[ ] Encryption in transit (HTTPS/TLS) for all public endpoints
[ ] Security Groups scoped to minimum required ports/IPs
[ ] CloudTrail enabled (audit log of all API calls)
[ ] Billing alerts configured
You should see
You should be able to explain the AWS Shared Responsibility Model and defense-in-depth (Security Group + NACL).

Try it in 5 minutes

Run the checklist above against every resource you've created so far (EC2, RDS, S3) — find any item that fails and fix it.

A quick word of caution

Don't treat security as an afterthought you'll 'add later' — build in least-privilege, encryption, and MFA from the very first day you create a resource.

Easy traps

  • Assuming 'AWS handles all cloud security for me' — under the Shared Responsibility Model, the customer also has responsibilities (access control, data encryption, application security)
  • Not enabling CloudTrail (the API call audit log) — if a security incident happens, investigating 'who did what' can become very difficult

Now try it yourself

Run the checklist above against every resource you've created so far (EC2, RDS, S3) — find any item that fails and fix it.

You'll know it worked when: You should be able to explain the AWS Shared Responsibility Model and defense-in-depth (Security Group + NACL).

AWS Security Best Practices | Thuta Learning