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

摘要

PROBLEM TO BE SOLVED: To provide an authentication information input device capable of making it difficult to analogize authentication information.SOLUTION: An authentication information input device includes: display means (110) for displaying a display pattern including at least pieces of image data selected one or more from each of an authentication image group, a key image group, and a dummy image group; and input means (110) for inputting a plurality of pieces of image data selected in order by a user operation from the pieces of image data included in the display pattern displayed by the display means (110) as authentication information used for permitting authentication of a user. Authentication of the user is permitted from a relative positional relation between input orders of key image data belonging to the key image group and authentication image data belonging to the authentication image group that are input by the input means (110).