Key rotation

What is key rotation?

Key rotation is the process of replacing an existing cryptographic key, API key, or authentication credential with a new one at regular intervals or whenever there is a security risk. The old key is then revoked or retired after the new key is successfully deployed.

The main purpose of key rotation is to reduce the risk of unauthorized access if a key is exposed or compromised.

Example of key rotation

Imagine an online store uses an API key to connect with an application to send transactional emails.

The application currently sends emails using API Key A.
As part of the company’s security and key renewal policy, a new API Key B is generated after a specific interval.
The application is updated to use API Key B from the updated time.
After confirming everything works correctly, API Key A is revoked.

Customers continue receiving emails without interruption, while the older key can no longer be misused. This same process applies to SMTP passwords, encryption keys, SSH keys, access tokens, database credentials, and other authentication secrets.

How does key rotation work?

Key rotation follows a simple cycle of replacing an old cryptographic key with a new one while ensuring that encrypted data and applications continue to function securely. Although the exact process varies depending on the system, it generally involves these steps:

Generate a new encryption key using a secure key management system.
Activate the new key and configure applications or services to use it for all future encryption operations.
Retain the old key temporarily so previously encrypted data can still be decrypted without interruption.
Re-encrypt data (if required) using the new key. Some systems re-encrypt existing data immediately, while others do so gradually or only when the data is accessed.
Retire and securely delete the old key once it’s no longer needed, preventing it from being used again.

Many organizations automate key rotation using in-house or third-party management tools or cloud key management services. Automated rotation reduces manual effort and minimizes the chance of forgotten or outdated credentials remaining active.

How often should you rotate keys?

There’s no universal rotation schedule because it depends on your organization’s security requirements and compliance obligations. As a general guideline:

Rotate production API keys every 60 to 90 days.
Rotate keys immediately if they’re suspected to be exposed, leaked, or compromised.
Rotate keys whenever employees with access leave the organization.
Follow any industry or regulatory requirements that apply to your business.

If your platform supports automated key rotation, enabling it helps maintain a consistent security posture without relying on manual reminders.

Why should you rotate keys?

Regular key rotation offers several important security and operational benefits. It usually:

Reduces the impact of leaked credentials: Even if a key is exposed, its usable lifetime is limited.
Strengthens overall security: Frequently replacing credentials lowers the risk of long-term unauthorized access.
Supports compliance: Many security frameworks and regulations recommend or require periodic credential rotation.
Limits insider risk: It prevents former employees or contractors from continuing to use outdated credentials after their access has been revoked.
Encourages better credential management: Regular rotation helps teams maintain an inventory of active keys and remove unused ones.

FAQ

Is key rotation the same as changing a password?

No. While both involve replacing credentials, key rotation specifically refers to replacing cryptographic keys, API keys, certificates, or authentication secrets used by applications and services.

Can key rotation be automated?

Yes, you can automate key rotation. Many cloud providers, key management services, and email platforms support automated key rotation, making it easier to replace credentials without disrupting applications.

What happens if you don’t rotate keys?

Keys that remain active for long periods are more likely to be forgotten, leaked, or misused. If a compromised key is never rotated, attackers may retain access until the issue is discovered and the credential is revoked.