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08/06/2026 4:59 pm
TL;DR: SSH key environments often grow into hundreds or thousands of unmanaged credentials, with unused keys, weak rotation discipline, and offboarding gaps creating persistent access risk according to StrongDM. The practical lesson is that SSH key governance is a lifecycle problem, not just a key-management problem.
NHIMG editorial — based on content published by StrongDM: SSH Key Management Explained: Best Practices & More
By the numbers:
- In a study by Dimensional Research, 40% of organizations said they don't rotate keys at all or only do so occasionally.
- Research shows that in some large organizations up to 90% of authorized keys are no longer used, and 10% of those grant privileged access.
Questions worth separating out
Q: What breaks when SSH keys are not rotated or revoked properly?
A: When SSH keys are not rotated or revoked properly, access can survive long after the original user, machine, or business need has changed.
Q: Why do SSH keys create governance problems in large environments?
A: SSH keys create governance problems in large environments because they scale as durable credentials, not as managed relationships.
Q: How do security teams know if SSH key management is actually working?
A: SSH key management is working when every key is inventoried, attributable, rotated on a defined schedule, and removed promptly when access ends.
Practitioner guidance
- Build a complete SSH key inventory Record every key, owner, host, expiry condition, and business justification so stale access can be identified before it becomes invisible.
- Enforce key rotation with offboarding checkpoints Tie key revocation to role changes, machine replacement, vendor exit, and retirement of the system that uses the key.
- Eliminate shared administrative keys Replace common system accounts with individually attributable access paths so one departing user cannot leave behind active shared credentials.
What's in the full article
StrongDM's full blog covers the operational detail this post intentionally leaves for the source:
- A step-by-step explanation of SSH key authentication, including public key verification and certificate-based access flows.
- Specific best practices for onboarding, offboarding, and rotating SSH keys across servers and user accounts.
- Detailed examples of how a centralized control plane brokers access and logs SSH sessions for auditing.
- Practical guidance for handling contractor and remote worker access without leaving long-lived keys behind.
👉 Read StrongDM's guide to SSH key management best practices →
SSH key sprawl and rotation gaps: what IAM teams need to know?
Explore further
08/06/2026 6:55 pm
SSH key management is really a lifecycle governance problem, not a cryptography problem. The article shows that the hard part is not generating keys, but knowing when they are still valid, who owns them, and when they should be removed. That is the same structural failure seen in broader NHI programmes when credentials outlive the business need that created them. Practitioners should treat keys as governed identities with a full lifecycle, not as static configuration artifacts.
A few things that frame the scale:
- The average estimated time to remediate a leaked secret is 27 days, despite 75% of organizations expressing strong confidence in their secrets management capabilities, according to The State of Secrets in AppSec.
- Only 44% of developers are reported to follow security best practices for secrets management, exposing a significant developer behaviour gap.
A question worth separating out:
Q: What should organizations do when SSH access is needed for contractors or remote teams?
A: Organizations should put contractor and remote access behind centrally mediated controls with clear expiry and revocation rules. The goal is to avoid leaving durable keys on servers or laptops, because those keys often outlive the assignment and remain usable after the work is done.
👉 Read our full editorial: SSH key management still breaks down without lifecycle governance
