Abstract. Information technology has irreversibly entered the daily activities of every person - the life of an ordinary person cannot be imagined without various gadgets. Most homes use embedded operating system devices (other than regular personal computers) that can connect to the Internet and even wirelessly. Everywhere people are surrounded by various terminals, readers, sensors, etc. This proliferation of smart technologies raises the issue of data security. However, it is currently not possible to propose a cryptographic primitive that can be implemented on all types of target devices. This article discusses continuous encryption algorithms and their cryptanalysis.