| 摘要 |
Provided is an authentication device and an authentication method of, even in the case of selecting correct images for authentication from among the displayed images to perform authentication, making hard to be read by others and improving security, and a program for causing a computer to execute the same. A main control portion 12 selects at random one or more correct images 23 to be displayed from a correct image DB 17 within the number of images to be displayable by a display portion 14 so as to be stored in a display correct image storage portion 19. Dummy images are selected only by the number of images that are displayable by the display portion 14 from a dummy image DB 18. The main control portion 12 lists and displays the selected display images on the display portion 14. The main control portion 12 changes a display number and display arrangement of correct images and dummy images so as to be differentiated from those in previous authentication. When a user selects correct images, an authentication control portion 13 compares correct images 23 that are registered in the display correct image storage portion 19 to images that are selected by the user, and in the case of coincidence, authentication is completed. |
