Аннотация: The article highlights the problems of data transmission over a computer network in various data transmission media: wired and wireless. The reliability and integrity of data transmitted over the network, which are sent from the source to the recipient, is considered. The studies of various scientists, as well as other researchers in the field of analyzing the reliability of data and protecting them from changes by the intruder, were studied. The methods and methods by which the researchers fought or proposed to deal with this problem are described. The article also discusses alternative research from the side of encrypting / decrypting data on the network and finding such network traffic. In general, the article is devoted to identifying problems in the transmission of data over the network, the analysis of this data.