Summary

A Japanese-language introduction to OpenID Connect (OIDC) by Kohei Toki, written on the premise that many developers use OIDC for authentication without knowing it well. The author argues that using OIDC without solid understanding risks slow debugging and serious security holes, and that OIDC is hard to learn because its concepts are difficult, many interrelated terms are involved, and the official specification reads too mechanically to serve as a learning text. Assuming almost no prior OIDC knowledge, the book starts from the background behind its emergence, works through each flow in turn, and covers representative security vulnerabilities and countermeasures. A sample application shows what implementation looks like in practice, including the concrete data exchanged. By the end, readers should have enough knowledge to develop applications that use OpenID Connect.

Target Readers

• Programmers and engineers planning to implement OpenID Connect in an application, who want the flows explained step by step rather than parsed cold from the specification
• Security staff responsible for checking an application's security, who need to follow OIDC's flows and token validation closely enough to spot where one goes wrong
• Developers who already use OIDC in production but suspect they don't fully understand it, and want to close gaps that could cause slow debugging or hidden vulnerabilities

Colophon

Publisher

Gijutsu-Hyohron

ISBN

978-4-297-15456-1

Published

Feb 2026

List price

¥3,300incl. taxMay differ from the actual selling price on Amazon