https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 16 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-16-keycloak-authentik-zitadel-ory-sso-oidc-saml-fapi-2026-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-keycloak-authentik-zitadel-ory-sso-oidc-saml-fapi-2026-deep-dive.en In 2026, OAuth 2.1 became an RFC, FAPI 2.0 went final and reached financial-services production, and Chrome and Edge shipped FedCM by default. Passkeys are no longer novel. This piece compares Keycloak 25, Authentik, Zitadel, Ory Hydra, Auth0, WorkOS, and Okta across protocol coverage, architecture, operating economics, and regulation — including Korea (PASS) and Japan (JPKI) realities. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) keycloakauthentikzitadelory-hydraauth0workosoktassooidcsamloauthfapifedcmwebauthn https://www.youngju.dev/blog/culture/2026-05-16-keycloak-authentik-zitadel-ory-sso-oidc-saml-fapi-2026-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-keycloak-authentik-zitadel-ory-sso-oidc-saml-fapi-2026-deep-dive.ja 2026年に入り、OAuth 2.1 が RFC として確定し、FAPI 2.0 が Final となって金融案件に乗り、Chrome と Edge は FedCM を既定で出荷した。パスキーはもはや新技術ではない。本稿では Keycloak 25、Authentik、Zitadel、Ory Hydra、Auth0、WorkOS、Okta をプロトコル / アーキテクチャ / 運用経済性 / 規制の観点で比較し、韓国の PASS、日本の JPKI といった地域要件も扱う。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) keycloakauthentikzitadelory-hydraauth0workosoktassooidcsamloauthfapifedcmwebauthn https://www.youngju.dev/blog/culture/2026-05-16-keycloak-authentik-zitadel-ory-sso-oidc-saml-fapi-2026-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-keycloak-authentik-zitadel-ory-sso-oidc-saml-fapi-2026-deep-dive 2026년 현재 OAuth 2.1이 RFC로 굳어졌고, FAPI 2.0이 금융권에 들어왔으며, Chrome과 Edge가 FedCM을 정식 출시했다. 패스키는 더 이상 신기술이 아니다. 이 글은 Keycloak 25, Authentik, Zitadel, Ory Hydra, Auth0, WorkOS, Okta를 프로토콜 / 아키텍처 / 운영 비용 / 규제 관점에서 비교하고, 한국 PASS와 일본 JPKI 같은 지역 요구사항도 함께 다룬다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) keycloakauthentikzitadelory-hydraauth0workosoktassooidcsamloauthfapifedcmwebauthn