In the conditions of universal Informatization, the problem of information security and information protection has
significantly worsened. This work provides an overview of the block encryption development. Block cipher - a kind of
symmetric cipher. A feature of the block cipher is the processing of a block of several bytes in one iteration. Block
cryptosystems break the message text into separate blocks and then convert these blocks using a key. Basic information
related to block encryption is presented, and the main analysis options are shown. The possibility of students' research
work on this topic was noted, and the review of international competitions on block ciphers research was performed.
A diagram is shown that can be applied in electronics, and a replacement table is generated and painted for
programming. In this case, both of these approaches are equivalent, meaning that an encrypted file on a computer is
decrypted on an electronic device and vice versa.