GENERATION/STORAGE SYSTEM OF COMPLEX INFINITE ONE-TIME PASSWORD BY USING FILE SYNCHRONIZATION, AND AUTHENTICATION SYSTEM THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a generation and storage system of a password, which can inexpensively and surely prevent the password of a user from being illicitly decoded or used by a third party. SOLUTION: The contents of a file such as an image and a document stored in a computer 10, etc., on the user's side and information such as a name and size of the file accompanying the file are transmitted from the computer 10 on the user's side to a server computer 14 in place of the password, the server computer 14 generates, stores a value to be an origin for generating the password based on the file contents and information accompanying the file which are transmitted from the user's side and deletes the file contents and the information accompanying the file which are transmitted from the user's side. In addition, this system is constituted so that a program for synchronizing the user's side with the server's side and for deriving the same value by its file information by every authentication is installed on the user's side.