hash.tex

\newpage
\section{Hash-generation}
\label{sec:hashes}

Some solutions to challenges are encrypted using MD5 hashes. In order to check your solution, you need to generate its MD5 hash and compare it to that provided. MD5 hashes can be generated at the following sites:

\begin{itemize}
    \item Wolfram alpha: (For example: md5 hash of ``q1.00'') \url{http://www.wolframalpha.com/input/?i=md5+hash+of+\%22q1.00\%22}
    \item \url{www.md5hashgenerator.com}
\end{itemize}

Since MD5 hashes are very sensitive to even single-digit variation, you must enter the solution \emph{exactly}. This means maintaining a sufficient level of accuracy when developing your solution, and then entering the solution according to the format suggested by the question. Some special input methods:

\begin{center}
\begin{tabular}{|l|l|}
    \hline
    \textbf{Solution} & \textbf{Input} \\ \hline
    $5 \times 10^{-476}$ & 5.00e-476 \\
    $5.0009 \times 10^{-476}$ & 5.00e-476 \\
    $-\infty$ & -infinity (never ``infinite'')\\
    $2 \pi$ & $6.28$ \\
    i & im(1) \\
    2i & im(2) \\
    1 + 2i & re(1)im(2) \\
    -0.0002548 i & im(-2.55e-4) \\
    1/i = i/-1 = -i & im(-1) \\
    $e^{i2\pi}$ [$= cos(2 \pi) + isin(2 \pi) = 1 + i0 = 1$] & 1.00 \\
    $e^{i\pi/3}$ [$= cos(\pi/3) + isin(\pi/3) = 0.5 + i 0.87$] & re(0.50)im(0.87) \\
    Choices in order A, B, C, D & abcd \\
    \hline
\end{tabular}
\end{center}

The first 6 digits of the MD5 sum should match the first 6 digits of the given solution.