2007-264839 is referenced by 4 patents.

PROBLEM TO BE SOLVED: To provide a matrix authentication system for reducing the risk of password leakage.SOLUTION: In this user authentication system for presenting a presentation pattern to a user who is authenticated, and for using a rule to be applied to the element of a specific position included in the presentation pattern for generating a one-time password as a password, an authentication server generates a pattern seed value as a value for uniquely determining the presentation pattern by combining it with user ID, and transmits it to an authentication request client, and the authentication request client generates and displays the presentation pattern according to a predetermined pattern element column generation rule based on the input user ID and the received pattern seed value, and accepts the input of the one-time password from the user, and transmits it to the authentication server, and the authentication server generates a verification code by reproducing the presentation pattern, and compares it with the one-time password for executing user authentication.

Title
User authentication system and its method
Application Number
2006-086603
Publication Number
2007-264839
Application Date
March 27, 2006
Publication Date
October 11, 2007
Inventor
Tamai Narutomo
Saito Tsugune
Ueda Yukiya
Assignee
Cse
IPC
H04L 09/32
G06F 21/20