The Tool Desk
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What a safe API key rotation involves
Rotation replaces a credential in the applications and services that use it. The goal is to limit how long a key remains useful without interrupting legitimate traffic. For routine maintenance, the safer pattern is replacement first, consumer updates second, validation third, and old-key retirement last. Google Cloud documents this sequence for managed service-account keys and Google Cloud API keys, though the details differ by credential type.
Do not assume that every provider permits two valid credentials at once, that disabling and deleting mean the same thing, or that deleting a key cancels tokens already issued from it. Check the provider’s instructions for the exact credential before scheduling a production change.
Before you change a production credential
Find every consumer
Record the credential type, owner, permissions, creation method, and every application, scheduled job, deployment environment, or other service that reads it. Google Cloud says replacement service-account keys must be deployed to all dependent applications; its guidance also recommends monitoring after the old key is disabled. An incomplete consumer list is a common reason a seemingly successful change breaks a less frequently used job.
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Identify how you will recognize both authentication failures and unexpected use. Know where the relevant application errors, provider usage metrics, and security or audit logs are visible before you begin.
Confirm overlap, revocation, and recovery behavior
Check whether the old and new credentials can coexist, how to disable the old one, whether it can be restored, and what happens to access tokens already issued from it. Google Cloud notes that deleting a service-account key cannot be undone and does not itself invalidate short-lived credentials already issued from that key. Do not promise zero downtime until you have confirmed the semantics for your specific provider and credential.
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Choose a change window and rollback path
Use your normal production change process. Decide in advance how you will revert consumers to the old key if the replacement fails, provided the old key is still safe to use and remains enabled. For a suspected compromise, that availability-first rollback may be inappropriate: continued unauthorized access can be a greater risk than disruption.
Routine rotation: a staged production procedure
- Create a replacement. Generate a new credential using the provider’s supported method. Give it only the permissions it needs and apply available restrictions. For Google Cloud API keys, Google recommends restricting use to the necessary applications or hosts and APIs. Store the secret in an approved secret-management system; do not commit it to source control or expose it in logs.
- Deploy it to consumers. Update every application and job through the established configuration or secret-delivery path. If your system supports it, roll out in controlled batches rather than changing every consumer at once. After each batch, confirm authentication succeeds and the application performs its expected work.
- Validate production behavior. Check service health, relevant error rates, authentication failures, and business functions that depend on the API. A successful deployment is not enough if a delayed job, rarely used endpoint, or separate environment still relies on the old key. Keep the old credential available during this check only if provider behavior and security conditions make overlap safe.
- Disable the old credential and observe. When consumers have moved and monitoring is healthy, disable the old key if the provider supports that step. Watch for failures and old-key usage that reveal a missed consumer. Google Cloud specifically recommends disabling replaced service-account keys and monitoring before deletion.
- Delete and document. Delete the old credential when it is safe to do so and the provider’s behavior is understood. Record the change, owner, and date; remove obsolete copies from deployment configuration; and review usage data for old-key traffic or unexpected use of the replacement.
If a step fails, stop the rollout and use the recovery path you established. Whether you can restore the old credential depends on the provider: Google Cloud warns that deleting a service-account key is irreversible, which is one reason disabling and observing it before deletion matters.
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How the sequence differs by credential type
| Credential or approach | What the cited guidance says | Practical implication |
|---|---|---|
| Google Cloud managed service-account keys | Google recommends creating a replacement, updating applications, disabling and monitoring the old key, then deleting it. Google recommends rotating managed keys at least every 90 days. Google Cloud: Service account key rotation | The 90-day interval is Google’s recommendation for this credential class, not a universal API-key schedule. Google also warns that production key expiry can cause accidental outages if expiry is not managed correctly. Google Cloud: Best practices for managing service account keys |
| Google Cloud API keys | Google describes periodically creating new keys, updating applications, and deleting old keys, and recommends restricting keys to the applications or hosts and APIs that need them. Google Cloud: Best practices for managing API keys | Follow the API-key guidance for that credential; do not assume all API keys have the same disable, overlap, or token behavior as service-account keys. |
| OAuth 2.0 client secrets | Google notes that changing an OAuth 2.0 client ID secret causes a temporary outage during rotation. Google Cloud: Respond to compromised Google Cloud credentials | Do not apply a seamless-overlap procedure unless the provider documents that it works for this secret type. |
| AWS access credentials and other stored API tokens | AWS recommends temporary credentials or IAM roles instead of long-lived AWS access keys where possible. For API tokens and keys that remain necessary, it recommends AWS Secrets Manager and automated rotation where possible. AWS: Store and use secrets securely | Distinguish AWS access credentials from third-party API tokens stored by an AWS workload; the right mechanism depends on which credential is being rotated. |
| Short-lived service-account access tokens issued from a Google Cloud key | Google says these tokens remain valid until expiry by default even after the source key is deleted. The documented way to immediately remove access is to disable or delete the represented service account, which also removes that account’s access for its workloads. Google Cloud: Create and delete service account keys | Deleting the source key is not necessarily immediate containment of already issued credentials. Confirm token lifetimes and emergency controls for the actual provider before relying on key deletion. |
When to rotate, and when to avoid long-lived keys
There is no established universal rotation interval for every API key. The right cadence depends on the secret’s function and protections, as OWASP’s Secrets Management Cheat Sheet explains. Google Cloud’s recommendation to rotate managed service-account keys at least every 90 days applies to that Google credential class, not to every provider or API key.
Where feasible, remove the need to store a persistent key. AWS recommends temporary credentials and IAM roles for AWS access; Google recommends workload identity federation for suitable external workloads. These options can reduce dependence on long-lived secrets, but they require a compatible workload and provider setup.
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For credentials that still need to be stored, a managed secret service can centralize storage and support auditing or automation. AWS recommends Secrets Manager and automated rotation where possible. Google, by contrast, does not recommend using its Secret Manager to store and rotate service-account keys when a workload can use a Google-recognized identity instead. Choose a mechanism that fits the provider and credential, rather than treating any one secret manager as a universal rotation solution. OWASP advises regular rotation and secure revocation when a secret is no longer needed or may be compromised; the appropriate lifetime depends on its function and protections. OWASP: Secrets Management Cheat Sheet
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Treat a suspected leak as a containment incident, not routine maintenance. Google Cloud recommends immediate rotation for suspected service-account-key compromise and describes generating a new credential, deploying it to dependent services, and revoking the old one. The response must balance the risk of ongoing unauthorized access against the service impact of immediate revocation.
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- Determine which credential is exposed and what permissions it grants; prioritize reducing unauthorized access.
- If safe and practical, issue a replacement and move dependent services quickly, but do not delay containment solely to preserve uninterrupted service when abuse is ongoing or likely.
- Revoke or disable the exposed credential using the provider’s documented controls. Check whether tokens already issued from it remain valid and what additional action is required to block them.
- Review provider usage and security logs for suspicious activity, then remove exposed copies from repositories, deployment settings, and logs where possible. Rotating the key does not by itself establish that the compromise has been contained.
For Google Cloud service-account keys, deleting the source key does not immediately invalidate short-lived access tokens already issued from it; those remain valid until expiry by default. Google documents disabling or deleting the represented service account as a way to immediately remove that account’s access, but doing so also removes access for its workloads. Equivalent controls and consequences vary by provider.
Quick Recap
Common causes of a failed rotation
- A hidden consumer was missed: an infrequent job or separate environment still uses the old credential. Inventory consumers and watch for old-key use after disabling.
- The new key has different permissions or restrictions: authentication may succeed in one path but fail for a workload that needs an additional API or permitted host. Constrain the key to required access, then validate actual application behavior.
- The credential cannot overlap: the provider may impose an outage during a secret change, as Google documents for OAuth client-secret rotation. Plan around the documented behavior rather than assuming a two-key window.
- Deletion was treated as immediate revocation: already issued tokens may outlive the source key. Check token lifetime and provider-specific emergency controls.
- The new secret was delivered through an unsafe path: source control or logs can create another exposure. Use an approved secret-delivery method and verify the replacement was not inadvertently exposed.
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