Authentication device, authentication system, and authentication method

An authentication device comprising:

• processing circuitry
• to generate challenge data which is a dataset based on at least one electromagnetic characteristic of a first authentication target device, acquired from the first authentication target device;
• to perform a comparison between the electromagnetic characteristic of the first authentication target device and the generated challenge data, and to generate a response data expected value representing a result of the comparison;
• and
• to perform a comparison between the generated response data expected value and response data related to a second authentication target device transmitted from a response device, and to determine authenticity of the second authentication target device, wherein
• the generated challenge data is transmitted to the response device,
• a result of a comparison between an electromagnetic characteristic of the second authentication target device, acquired from the second authentication target device, and the transmitted challenge data is received as the response data from the response device,
• the electromagnetic characteristic of the first authentication target device and the electromagnetic characteristic of the second authentication target device are characteristics expressed as a two-dimensional graph including an X axis and a Y axis, and
• the challenge data is generated as a set [Xn, Yn] (n is an integer) of a plurality of X-axis values Xn and Y-axis threshold values Yn corresponding to the respective X-axis values.