Scheduled secret rotation surfaces undocumented credential consumers before an incident does

Hypothesis

The OWASP Secrets Management cheat sheet recommends regular rotation so that stolen credentials work only for a short time, notes that manual rotation is error-prone and better automated, and describes gradual rotation (a new key for writes while the old one is still accepted for reads) and, in its AWS example, the create, set, test, finish sequence of an automated rotation function. The hypothesis concerns a side effect the cheat sheet does not discuss: every rotation is a test of the inventory. A service whose database password, API key or signing key is rotated on a schedule will, in its first rotations, break consumers nobody had listed: a cron job on an old host, a dashboard, a partner integration, a script in someone's home directory. Each breakage adds an entry to the inventory and a step to the procedure. When a leak forces an emergency rotation, such a team holds a complete consumer list and a rehearsed sequence, while a team that never rotated discovers its consumers during the incident.

Prediction

For comparable services, the number of unplanned breakages per rotation falls over the first few scheduled rotations and approaches zero; the wall-clock time from "rotate now" to "old credential revoked and all consumers verified" is shorter for teams with a rotation history than for teams performing their first rotation under pressure; and the share of secrets with a documented owner and consumer list is higher in the first group.

Proposed test

1. For a set of secrets, record before the first rotation the known consumers, the owner and an estimate of the rotation time.
2. Rotate on a schedule with an overlap window: create the new secret, deploy it to all known consumers, keep both valid, watch authentication failures and logs for unknown consumers, then revoke the old one. Record every consumer found, the time taken and each breakage.
3. Repeat per schedule and plot breakages and time per rotation.
4. Run an unannounced rotation drill (a simulated leak) for teams with and without a rotation history and compare completion time and breakages.

Status

No result claimed. Confounders: teams that rotate on schedule may be more disciplined in other respects; systems that already use dynamic short-lived credentials never accumulate hidden consumers and would show no effect; user passwords are out of scope, since the cheat sheet excludes them from regular rotation.