关键词: 4G网络, 视频传输, 数据加密, TCP/IP协议, SM4算法

Abstract: A device that uses HDMI or USB interface to receive video data stream of external camera or DV machine is designed. The device encodes and encrypts the video stream data, then transmits the encrypted and compressed video stream data to the server through 4G mobile network. When a user device is connected to the remote server, it can receive and play the video stream data. The software of the transmission equipment realizes the modules of video acquisition and coding, 4G mobile network, data encryption, TCP / IP protocol for data transmission and so on. It can send encrypted data with remote server through private protocol, which verifies the working performance and reliability of each module.

Key words: 4Gnetwork, videotransmission, dataencryption, TCP/IPprotocol, SM4algorithm