In the LINE account login service, the authentication code is displayed when logging in, and the two-stage authentication services that have not yet been applied are reviewed and applied sequentially by entering the authentication code from the registered user's LINE account. As the effect of two-stage authentication, "passwords and other authentication of my memory are authenticated through my LINE account, in case the password is known by a third party, a mechanism to prevent illegal login."
参考イメージ: LINEログインにおける二段階認証
From October 3, 2020 to January 23, 2021, users were notified through the LINE official account that "the password change cannot be confirmed since the illegal login trial." At the same time, the password reset is entrusted.
When you log in to LINE-related services or LINE on your desktop, you will receive a login notification from an official account called "LINE", which displays the badge of the authenticated account. First, send a "password changed" message through the LINE official account. Then sent through the LINE official account "[important] an illegal login attempt detected in the LINE account in use, now the login password is still at risk, and as an emergency measure, the password was initialized at 18:40 on 2021-1-21 and 10:00 on 2021-1-23".
In addition, if the password set in LINE uses a password that is common to other services, it is recommended that you also consider changing the password of other services.
参考イメージ: ログイン通知If you confirm the contents of the message and don't remember it in the login notification, it's best to change your password.