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\def\headlineaux{\sc Math 609/597: Cryptography
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\newcommand{\assignmentNumber}{1}
\newcommand{\outdate}{26 August, 1993}
\newcommand{\duedate}{9 September, 1993}

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\begin{titlepage}\begin{centerline}{\Huge \framebox{Burt Rosenberg}}
\end{centerline}\end{titlepage}

\section*{Problem Set \assignmentNumber \hfill{\parbox{3in}
    {\small\sc\begin{flushright} Out: \outdate
     \\ Due: \duedate\end{flushright}}}}

Read Chapters 1--4, 8, 9 from
{\em Elementary Cryptanalysis} by Helen Gaines
and try to solve some cryptograms from these chapters.
Hand in any ciphers solved by
the due date.

\renewcommand{\assignmentNumber}{2}
\renewcommand{\outdate}{7 September, 1993}
\renewcommand{\duedate}{23 September, 1993}

\section*{Problem Set \assignmentNumber \hfill{\parbox{3in}
    {\small\sc\begin{flushright} Out: \outdate
     \\ Due: \duedate\end{flushright}}}}
            
\begin{enumerate}
\item
Read Chapters 1 and 3 from {\em A Course in Number Theory
and Cryptography} by Neal Koblitz and review the handout on
number theory distributed in class.
Do problems,
\begin{itemize}
\item From Chapter 1, Section 2: Problems 5--8.
\item From Chapter 1, Section 3: Problems 1--5.
\end{itemize}

\item
Write a program which does letter frequency analysis of
a text and use it to decode the messages of problems 1 and 2,
page 61 from Koblitz's book.

\item
Write a program which enciphers and deciphers by one of
the methods discussed in class: Simple Substitution,
Affine Transformation, Vig\`enere,
Transposition, Nihilist or Playfair.
Encipher a message for
the class to attempt to decipher.
\end{enumerate}
\end{document}
