\documentclass[twoside]{homework}
\usepackage{enumerate}
\studname{student name (student uni)}
\studmail{uni@columbia.edu}
\coursename{COMS W4261:   Introduction to Cryptography}
\collab{unis of students you discussed the homework with}   % THE UNI'S OF STUDENTS YOU DISCUSSED WITH
\hwNo{1}


\begin{document}
\maketitle

\section*{Problem 1}
Write your answer here ...

\section*{Problem 2}
Write your answer here ...

\section*{Problem 3} 
\begin{enumerate}[(a)]
\item your answer for part (a)

\item (optional Extra Credit:)  your answer for part (b) 
\end{enumerate}

\section*{Problem 4}
\begin{enumerate}[(a)]
\item your answer for part (a)

\item your answer for part (b)

\end{enumerate} 

\section*{Problem 5}
Write your answer here ...



\end{document} 
