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

摘要

At the time of input of authentication information, even when the hand and the input screen are seen from the third person, guess of authentication information is made difficult. A plurality of keys serving as input means are divided into a first region and a second region. Then, the first region and the second region are caused to transit between a first state and a second state distinguished from each other depending on the displayed contents. When a region where a key to be inputted for the input of authentication information is arranged is in the second state, input to the above-mentioned plurality of keys is recognized as dummy.