Development of Video Encryption Scheme Based on Quantum Controlled Dense Coding Using GHZ State for Smart Home Scenario

The smart home has security problems such as information leakage during file transmission, beyond the classical cryptographic scheme, quantum cryptography provides new solutions. A scheme for quantum-controlled dense coding with an extended GHZ state is investigated. In the home Internet of Things, monitoring devices, display devices, and home gateways complete the encrypted transmission of video files through the shared GHZ state. The method divided the file signature and the data part of the video file, utilizes quantum-controlled dense coding to form a sequence of encoded data packets, and reorders the data packets in sequence before transmission to ensure the security of data transmission. Experimental analysis shows that the scheme achieves high fidelity of 99.95% under the condition of adding noise. According to the nature of dense coding and no-cloning theorem, this scheme has high transmission efficiency and low computational cost and can realize the safe transmission of video files in a restricted environment.