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1. (WO2014207826) USER AUTHENTICATION SYSTEM, USER AUTHENTICATION METHOD, PROGRAM, AND INFORMATION STORAGE MEDIUM

Pub. No.:    WO/2014/207826    International Application No.:    PCT/JP2013/067411
Publication Date: Thu Jan 01 00:59:59 CET 2015 International Filing Date: Wed Jun 26 01:59:59 CEST 2013
IPC: G06F 21/31
Applicants: RAKUTEN, INC.
楽天株式会社
Inventors: KOSHINUMA, Takaaki
越沼 尊章
Title: USER AUTHENTICATION SYSTEM, USER AUTHENTICATION METHOD, PROGRAM, AND INFORMATION STORAGE MEDIUM
Abstract:
In order to suppress successful user authentication by another person even if user information becomes known to the other person, a user authentication system includes: an authentication information acquisition unit (20) that obtains a user password; a user authentication unit (22) that performs user authentication on the basis of the password; and an authentication procedure alteration unit (28) that changes the user authentication procedure used by the user authentication unit (22), in the event of failed user authentication and the password matching or being similar to a password candidate on the basis of user-related information.