What to check after you turn DMARC on
Publishing a DMARC record starts an ongoing process. Verify legitimate mail streams, review alignment failures, and make onboarding new senders part of normal change control.
Passwords that are still in Git history
Deleting a secret from the latest version does not invalidate it or remove every earlier copy. Contain the credential first, then assess repository history and any evidence of use.
Who can reach a Kubernetes cluster
A cluster’s exposure includes more than its public endpoint. Review administrators, workload identities, role bindings, credentials, network paths, and access to sensitive configuration.
What a container does not isolate
A container’s boundary depends on its configuration and the host it shares. Review privilege, mounted resources, credentials, network access, and runtime controls as a complete deployment.
Where ordinary IT ends and a safety system begins
A system connected to physical operations can fail in ways that affect safety, not only information. Coordinate security work with the people responsible for the process and its safe operation.
Ransomware is a decision for leadership, not only for IT
A ransomware incident can force decisions about operations, disclosure, external support, and recovery priorities. Establish the authority and contact routes before the team is under pressure.
How to talk about an incident before you know everything
People can make better decisions when an incident update identifies facts, gaps, current actions, and the next communication point. Avoid letting a confident tone outrun the evidence.
How long to keep security logs
Retention is an operational decision about which events must remain available, for how long, and at what cost and sensitivity. Connect the window to incident questions and real search capability.
Secure defaults people will leave switched on
A protective default is effective when people can complete real work without disabling it. Build a usable route for legitimate exceptions and test the resulting behavior.
How to judge a supplier without a giant spreadsheet
A supplier with little stored data can still have powerful access or support a critical workflow. Match your review to the service boundary, permissions, and consequences of disruption.