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+\documentclass[a4paper,12pt]{extarticle}
+
+\usepackage[T2A]{fontenc}
+\usepackage[english,russian]{babel}
+\usepackage[
+  left=2.5cm, right=2.5cm,
+  top=1.5cm, bottom=2cm,
+]{geometry}
+\usepackage{amsmath}
+\usepackage{amsthm}
+\usepackage{indentfirst}
+\usepackage{underscore}
+\usepackage{multirow}
+\usepackage{float}
+\usepackage{setspace}
+\singlespacing
+\usepackage{graphicx}
+\graphicspath{{./images/}}
+
+\theoremstyle{definition}
+\newtheorem{definition}{Definition}[subsection]
+\newtheorem*{note}{Note}
+
+\setcounter{tocdepth}{3}
+
+\title{
+  {\scshape \bfseries Cryptographic security of information}\\
+  {Block ciphers}\\
+  {\Large ГОСТ Р 34.12-2015}}
+\author{Переведено: Андрей Гущин, КНиИТ, 431 группа}
+\date{}
+
+\begin{document}
+
+\maketitle
+
+\section*{Abstract}
+
+This standard contains a description of block encryption algorithms used in
+cryptographic techniques of information security.
+
+The need to develop a standard is caused by the need to create block ciphers
+with different block lengths that meet modern requirements for cryptographic
+strength and operational qualities.
+
+This standard is terminologically and conceptually linked to the international
+standards ISO/IEC 10116 and the ISO/IEC 18033 series.
+
+
+\section{Scope}
+
+This standard defines algorithms of basic block ciphers used in cryptographic
+techniques of processing and protecting the information, including ensuring
+confidentiality, authenticity and integrity of information during its
+transmission, processing and storage in automated systems.
+
+The cryptographic algorithms defined in this standard are designed for hardware
+or software implementation, meet modern cryptographic requirements and do not
+impose restrictions on the degree of secrecy of the protected information.
+
+The standard is recommended for use in the development, operation and
+modernization of general purpose information processing systems.
+
+
+\section{Terms, definitions and designations}
+
+\subsection{Terms and definitions}
+
+The following terms and definitions are used in this standard.
+
+\begin{definition}
+  \textbf{Encryption algorithm} --- algorithm that implements encryption, i.e.
+  converting plaintext into ciphertext.
+\end{definition}
+
+\begin{definition}
+  \textbf{Decryption algorithm} --- algorithm that implements decryption, i.e.
+  converting ciphertext into plaintext.
+\end{definition}
+
+\begin{definition}
+  \textbf{Basic block cipher} --- block cipher that implements for any fixed key
+  single reversible mapping from a set of plaintext blocks of fixed length into
+  ciphertext blocks of same length.
+\end{definition}
+
+\begin{definition}
+  \textbf{Block} --- string of bits of a defined length.
+\end{definition}
+
+\begin{definition}
+  \textbf{Block cipher} --- cipher from a class of symmetric cryptographic
+  techniques in which an encryption algorithm is applied to plaintext blocks to
+  compute ciphertext blocks.
+\end{definition}
+
+\begin{note}
+  This standard defines terms ``block cipher'' and ``algorithm of block
+  encryption'' to be synonyms.
+\end{note}
+
+\begin{definition}
+  \textbf{Encryption} --- reversible transformation of data using a cipher that
+  forms a ciphertext from plaintext.
+\end{definition}
+
+\begin{definition}
+  \textbf{Round key} --- sequence of characters computed with the key schedule
+  algorithm that defines the transformation in one iteration of the block
+  cipher.
+\end{definition}
+
+\begin{definition}
+  \textbf{Key} --- variable parameter in the form of a sequence of characters
+  that defines the cryptographic transformation.
+\end{definition}
+
+\begin{note}
+  This standard only considers keys in the form of a sequence of binary symbols
+  (bits).
+\end{note}
+
+\begin{definition}
+  \textbf{Plaintext} --- unencrypted information.
+\end{definition}
+
+\begin{definition}
+  \textbf{Key schedule} --- algorithm of computation of round keys from cipher
+  key.
+\end{definition}
+
+\begin{definition}
+  \textbf{Decryption} --- reversal of the corresponding encryption.
+\end{definition}
+
+\begin{note}
+  To preserve terminological continuity with scientific and technical
+  publications, this standard uses the term ``encryption'' for both operations
+  defined by the terms ``encryption'' and ``decryption''. The specific meaning
+  of the term ``encryption'' is determined based on the context.
+\end{note}
+
+\begin{definition}
+  \textbf{Symmetric cryptographic technique} --- cryptographic technique that
+  uses same key for the transformation performed by both the sender and the
+  recipient.
+\end{definition}
+
+\begin{definition}
+  \textbf{Cipher} --- cryptographic technique used to ensure confidentiality
+  of data, including an encryption algorithm and a decryption algorithm.
+\end{definition}
+
+\begin{definition}
+  \textbf{Ciphertext} --- plaintext data which has been encrypted to hide its
+  content.
+\end{definition}
+
+\subsection{Designations}
+
+\dots
+
+\section{General provisions}
+
+This standard defines two basic block ciphers with block lengths of $n = 128$
+bits and $n = 64$ bits and with key lengths of $k = 256$ bits.
+
+\begin{note}\hfill
+  \begin{enumerate}
+    \item
+      Cipher with block length of $n = 128$ bits defined in this standard can
+      be referred to as ``Kuznyechik'' (``Кузнечик'').
+    \item
+      Cipher with block length of $n = 64$ bits defined in this standard can
+      be referred to as ``Magma'' (``Магма'').
+  \end{enumerate}
+\end{note}
+
+\dots
+
+\end{document}