Out-of-band authentication protocol for digital signage and smartphone interaction

An interactive digital signage system which allow users to fetch detailed information using their smartphone is widely deployed. Bluetooth Low Energy(BLE) broadcast beacon is a one of possible method to broadcast a detailed information to users. However, BLE beacon doesn't provide a way to assay an authenticity of beacon since BLE broadcast is insecure untrusted communication. Out-of-band authentication is used to improve trustworthiness for such untrusted pathway. A new authentication protocol is proposed to assay the authenticity of digital signage when the information is broadcasted via BLE beacon. The authors implement the protocol and evaluate its effectiveness.