Encrypting an EBS Volume in AWS

Overview

Amazon Elastic Block Store (EBS) encryption ensures that all data stored in an EBS volume is protected. When an encrypted EBS volume is created, it provides the following security benefits:

• Data at rest is encrypted inside the volume.
• Data in transit between the instance and the volume is encrypted.
• EBS snapshots of the volume are encrypted.
• New volumes created from encrypted snapshots remain encrypted.

The encryption and decryption process is managed transparently by EC2 and EBS, meaning no manual intervention is required.

Encryption Details

• EBS encryption has minimal impact on latency.
• It uses AWS Key Management Service (KMS) with AES-256 encryption.
• To encrypt an unencrypted snapshot, you must copy it and enable encryption during the copy process.

How to Encrypt an Unencrypted EBS Volume

Since existing EBS volumes cannot be directly encrypted, the process involves creating an encrypted copy of the volume. Follow these steps:

1. Create a Snapshot of the Unencrypted EBS Volume

1. Go to the EC2 Dashboard.
2. Select Elastic Block Store (EBS) → Volumes.
3. Identify the unencrypted volume.
4. Click Actions → Create Snapshot.