> For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt.

# RCIAM

> **Themelio compatibility reference.** This page describes the retained Themelio implementation or its historical design. Check the [parallel-operation guide](/compatibility/index.md) before applying it to the current platform.

RCIAM (Research Community Identity and Access Management) is GRNET's federated identity proxy service. It is the main authentication provider for Themelio, proxying other providers such as MyAccessID and supporting federated login via eduGAIN and eIDAS through the OpenID Connect (OIDC) standard.

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