| 摘要 |
PROBLEM TO BE SOLVED: To provide a user-friendly authentication device for enhancing security of authentication by reflecting density of exchanges on a community, in a group form wherein the community is formed. SOLUTION: Fig.6(A) shows a correct answer image to be given first to an initial member. Fig.6(B) shows images to be displayed in initial login. Fig.6(C) shows a change of the images displayed in login after one week. The correct answer image is automatically and slightly changed once a week. Fig.6(D) shows, for example, the images to be displayed in login half a year later. The correct answer image is significantly changed from the initial correct answer when logged in half a year later, as shown in the Fig.6 (D), by changing the image each week little by little. COPYRIGHT: (C)2011,JPO&INPIT |
