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

摘要

PROBLEM TO BE SOLVED: To provide an authentication information input device which inhibits a third person from easily guessing authentication information.SOLUTION: An authentication information input device comprises: display means (110) which displays a display pattern including at least one piece of key information and every piece or the predetermined number of pieces of authentication information belonging to the same group as the key information, that are selected from storage means (131); and input means (110) which receives at least one piece of information selected by a user operation from pieces of information composing the display pattern displayed on the display means (110), as input of authentication information that is to be used for authenticating the user. The user is authenticated when the user performs the user operation which selects every piece or the predetermined number of pieces of authentication information belonging to the same group as the key information displayed on the display means (110).