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NIST SP 800-207A (Initial Public Draft)

A Zero Trust Architecture Model for Access Control in Cloud-Native Applications in Multi-Cloud Environments

Date Published: April 18, 2023
Comments Due: June 7, 2023 (public comment period is CLOSED)
Email Questions to:


Ramaswamy Chandramouli (NIST), Zack Butcher (Tetrate)


Enterprise application environments consist of geographically distributed and loosely coupled microservices that span multiple cloud and on-premises environments. They are accessed by a userbase from different locations through different devices. This scenario calls for establishing trust in all enterprise access entities, data sources, and computing services through secure communication and the validation of access policies.

Zero trust architecture (ZTA) and the principles on which it is built have been accepted as the state of practice for obtaining necessary security assurances, often enabled by an integrated application service infrastructure, such as a service mesh. ZTA can only be realized through a comprehensive policy framework that dynamically governs the authentication and authorization of all entities through status assessments (e.g., user, service, and requested resource. This guidance recommends:

  • The formulation of network-tier and identity-tier policies and
  • The configuration of technology components that will enable the deployment and enforcement of different policies (e.g., gateways, infrastructure for service identities, authentication, and authorization tokens with the help of a central coordination infrastructure).

NOTE: A call for patent claims is included on page ii of this draft. For additional information, see the Information Technology Laboratory (ITL) Patent Policy – Inclusion of Patents in ITL Publications.




egress gateway; identity-tier policies; ingress gateway; microservices; multi-cloud; network-tier policies; service mesh; sidecar proxy; SPIFFE; transit gateway; zero trust; zero trust architecture
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Supplemental Material:
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Document History:
04/18/23: SP 800-207A (Draft)
09/13/23: SP 800-207A (Final)


Security and Privacy

access control, zero trust


cloud & virtualization