This document presents the 2025 revision of the AARC Blueprint Architecture (AARC-BPA-2025), providing software architects and technical decision-makers with a modular framework for designing Authentication and Authorisation Infrastructures (AAIs) to support international research collaborations. Building on AARC-BPA-2019, it introduces a refined architecture based on Functional Capabilities – Identity Management, Collaboration Management, and Service Integration – while retaining the established five-layer component model. The capability-based perspective clarifies functional responsibilities, supports modular deployment patterns, and enables interoperable implementations across independent administrative domains. AARC-BPA-2025 incorporates updated trust models and reflects insights from real-world implementations. The revision is backwards compatible with AARC-BPA-2019 deployments and aligns with evolving policy and technical requirements within the international research ecosystem..

Document URL: https://docs.google.com/document/d/1R86JBLSWWAav5hj30z4nmrpInq2BG2eHU3MOF8yrdaU/edit
Status: Final Call
DOI: Pending
Errata: none
Supersedes: AARC-G045

An AARC TREE project-specific version of this document is available as D1.1 Blueprint Architectures Initial revision – Guidance on the Federation Concept, and Community Attributes.