USER AUTHENTICATION SYSTEM, USER AUTHENTICATION METHOD, PROGRAM, AND INFORMATION STORAGE MEDIUM

摘要

A stranger who has come across user information of a user is prevented from being successfully authenticated as the user. A user authentication system includes: an authentication information acquisition unit (20) configured to obtain an entered password of a user; a user authentication unit (22) configured to execute authentication of the user based on the entered password; and an authentication procedure change unit (28) configured to change, when the authentication of the user fails and the entered password matches or is similar to a password candidate that is based on information associated with the user, a procedure of the authentication of the user which is executed by the user authentication unit (22), based on whether or not a genuine password of the user matches or is similar to the password candidate.

主权项

1. A user authentication system, comprising:
an authentication information acquisition unit for acquiring an entered password of a user; an user authentication unit for executing authentication of the user based on the entered password; a determination unit for determining whether or not a genuine password of the user matches or is similar to a password candidate that is based on information associated with the user; and an authentication procedure change unit for changing, when the authentication of the user fails and the entered password matches or is similar to the password candidate, a procedure of the authentication of the user which is executed by the user authentication unit, based on a result of the determination by the determination unit.