What this article covers
Zero Trust changes how access to resources is decided. Being on the corporate network should not, by itself, authorize an account. Adoption can start with one important application and progress according to the company’s dependencies and operational capacity.
1. Choose a resource and identify its users
NIST SP 800-207 describes an architecture centered on resources, identities and access decisions, without implicit trust based solely on network location. It provides a design reference, not a mandatory shopping list of products.
Select an application such as a service’s administration console. Identify employees, contractors, service accounts and integrations that need it. Record the reason for each access and dependencies that would prevent an immediate change.
2. Define the access policy
Set permitted actions and verifiable conditions for each role. Consider identity, multifactor authentication, device posture and the sensitivity of the operation. Administrative privileges require justification and periodic review.
- Replace shared accounts where technically possible.
- Separate everyday and administrative accounts.
- Revoke access when employment or a contract ends.
- Document exceptions, owners and expiry dates.
3. Implement without losing continuity
Observe legitimate access first and test the policy with a limited group. An unexpected block can interrupt support or automation. Prepare rollback and a controlled emergency procedure with logging and subsequent review.
Service accounts need their own design: do not copy a human user rule without checking authentication, credential rotation and service dependencies.
4. Test granting, denial and revocation
Verify permitted access as well as a disabled account, a device outside policy and an action beyond the assigned role. Confirm that decisions are logged with enough context for investigation without recording secrets.
Check whether revocation reaches existing sessions and integrations according to the adopted design. A new rule at login does not prove that every previously established connection has ended.
5. Expand based on results
The pilot should deliver an access map, applied policy, test results, exceptions and an operational owner. Track incorrect blocks, unowned privileges and the time needed to remove access. Use this evidence to select the next resource.
Zero Trust does not remove the need for patching, data protection or recovery. Explore our security services and the ransomware prevention and recovery roadmap when assessing architecture and priorities.