URL：https://images.pingidentity.com/image/upload/f_auto,q_auto,w_auto,c_scale/ping_dam/content/dam/ping-6-2-assets/blogs/2021/1130/token-based-authentication-hard-connected-tokens-one-time-password-otp.png
掲載元：https://www.pingidentity.com/fr/resources/blog/post/ultimate-guide-token-based-authentication.html
