Input device and information processing device

An input device inputting information by using a user's fingertip, the input device comprising:

• a display mechanism having a display surface which displays an image, an aerial-image forming mechanism which projects the image displayed on the display surface into a space to form an image as an aerial image, a detection mechanism detecting a position of the user's fingertip in an aerial-image display region, which is a region in which the aerial image is displayed, a control board having a control portion controlling the input device, and a fraud detection mechanism detecting that a fraud was committed against the input device, wherein the aerial-image display region is an input portion inputting information;
• the control portion encrypts image data, which is data of the image displayed on the display surface, and transmits the encrypted image data to the display mechanism;
• the detection mechanism encrypts position data, which is data of a detected position of the user's fingertip, and transmits the encrypted position data to the control portion;
• and
• at least a fraud against a position-data signal line which transmits the encrypted position data from the detection mechanism to the control board and a fraud against the control board is detected by the fraud detection mechanism.