INPUT INFORMATION AUTHENTICATION DEVICE, SERVER DEVICE, INPUT INFORMATION AUTHENTICATION SYSTEM, AND PROGRAM FOR DEVICE

摘要

PROBLEM TO BE SOLVED: To make it difficult to know input contents to be collated with authentication information for matching by analogy even if a third person views hands and an input screen during input of the authentication information.SOLUTION: Authentication auxiliary information is stored in advance as key top information. Further, authentication information is stored in advance as definition information which is information corresponding to a key operation on input means. Then an arrangement pattern of the key top information assigned to a plurality of keys of the input means is changed each time key input for authentication is performed, and while information corresponding to an input operation on the input means when the key top information of the authentication auxiliary information is in a predetermined position relation with the key top information included in the definition information is used for the authentication, the information corresponding to an input operation on the input means when the key top information of the authentication auxiliary information is not in the predetermined position relation with the key top information included in the definition information is not used for the authentication.