公的個人認証サービス（JPKI）｜デジタル庁

This page provides comprehensive information about the Japanese Public Key Infrastructure (JPKI) service for municipalities and private businesses. JPKI uses electronic certificates embedded in My Number Cards to authenticate users and verify document integrity online. The service improves customer service, reduces administrative costs, and enhances security. As of March 2026, 1,183 private companies use JPKI, including banks and financial institutions. The page covers implementation methods, procedures, usage fees, how authentication works, electronic certificate types, and recent service expansions including smartphone functionality.