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

摘要

PROBLEM TO BE SOLVED: To provide an authentication information input device for making it difficult for a third person to reason authentication information by analogy.SOLUTION: The authentication information input device includes: a display input part (110) for displaying a display image 10 selected from a display image storage part (133) for storing a plurality of display images 10 each including at least a first image MP which satisfies at least one condition and does not satisfy at least one condition between two or more conditions identifiable by a user on the basis of the memory of a user himself or herself and a second image DP which does not satisfy all the conditions; and a display input part (110) for inputting at least one image selected by a user operation from among the display images 10 displayed by the display input part (110) as authentication information to be used for permitting the authentication of the user. When the first image MP included in the display image 10 displayed by the display input part (110) is selected by the user operation, the authentication of the user is permitted.