\documentclass{../Lecture}
\usepackage{../preamble}

\title{Криптографические методы защиты информации}
\author{Андрей Гущин}
\date{\today}

\begin{document}

\maketitle
\tableofcontents

\input{lectures/lecture1.tex}
% \input{lectures/lecture2.tex}
\input{lectures/lecture3.tex}
\input{lectures/lecture4.tex}
\input{lectures/lecture5.tex}
\input{lectures/lecture6.tex}
\input{lectures/lecture7.tex}
\input{lectures/lecture8.tex}

\end{document}