API Key Usage Inventory: 4 Evidence Signals for Edtech Service Reviews
Short answer: a key's last-used timestamp cannot tell an edtech reviewer which service holds it. Attribute the credential through four independent signals: a stable, nonsecret key identifier, authenticated caller identity, workload deployment records, and per-key request events. Record disagreements instead of guessing. An access review is signable only when its owner can inspect the evidence,…
The article outlines a method for edtech service reviews to determine which service holds an API key using four key evidence signals. These signals include a stable, nonsecret key identifier, authenticated caller identity, workload deployment records, and per-key request events. The article emphasizes the importance of recording disagreements and not making assumptions.
It also highlights that a key's last-used timestamp cannot determine which service holds it. The article provides a simple Python reconciler that takes inputs such as key identifiers, owners, intended workloads, deployments, and events, and produces an evidence bundle with a disposition for each key. The reconciler helps distinguish between a notebook-to-production experiment and a scheduled course assistant that might share a network address.
The article concludes by recommending the use of OWASP's secrets guidance for inventory, access control, rotation, and logging around the secret lifecycle.
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