Authentication system

An authentication system comprising:

• a plurality of communication devices;
• and
• a control device configured to execute a process on a basis of information obtained through wireless communication between the respective communication devices and other communication device that is different from the plurality of communication devices,
• wherein each of the plurality of communication devices includes a wireless communication section configured to perform wireless communication with the other communication device, and
• the control device determines that the other communication device is successfully authenticated in a case where any one of a plurality of pieces of information regarding distances between the respective communication devices and the other communication device satisfies a designated condition on a basis of the pieces of information regarding the distances obtained through the wireless communication between the respective communication devices and the other communication device,
• wherein the control device determines that authentication of the other communication device is failed in a case where all the pieces of information regarding the distances do not satisfy the designated condition, and wherein
• the plurality of communication devices includes a first communication device and one or more second communication devices,
• each of the one or more second communication devices is connected to the first communication device, and transmits the information regarding the distance, and
• the first communication device is connected to the control device and the one or more second communication devices, and transmits correspondence information that is information corresponding to at least any of information regarding the distance obtained by the first communication device and information regarding the respective distances received from the one or more second communication devices.