Secrets are a constantly recurring problem. Passwords, API keys, certificates, tokens. Your system has hundreds of them, they rotate at different rates, different teams need different access. If you get this wrong, your infrastructure is compromised.
The problem gets worse as you scale
In a small system, you might just check secrets into a private repo. That breaks immediately when you have multiple environments, CI/CD pipelines, teams in different places. You need a system that handles rotation, access control, audit logging, and emergency revocation.
Vault-like systems are the baseline now
Tools like HashiCorp Vault, AWS Secrets Manager, Azure Key Vault solve the core problem. They store secrets, control who can access them, rotate them on schedule, and log everything. You probably should be using one if you're not already.
Rotation is mandatory, not optional
If a secret is compromised, the damage window depends on when you found it and rotated. Frequent rotation means a leak affects less. Automated rotation is safer than manual. There's no good excuse not to rotate regularly.
Different secrets, different handling
API keys from your own infrastructure are different from customer credentials, which are different from service-to-service tokens. They need different storage, access patterns, and rotation frequencies. One policy doesn't work for all.
The audit trail is as important as the storage
You need to know who accessed what secret, when, from where. That history is your investigation tool if something goes wrong. If you can't audit access, you can't respond effectively to a breach.