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\section*{Homework 6}

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\begin{enumerate}
\item Explain briefly the purpose of the certification authority in
  the public-private key encryption scheme.

\item Explain briefly what is meant by a certification authority
  becoming ``too big to fail'' when it has issued a large number 
  of certificates.

\item In which situations does it make sense to install
  invalid (self-signed) certificates?


%\item Zero-knowledge protocols depend on three main properties called
%  completeness, soundness and zero-knowledge.  Explain what they mean?

%\item Why do zero-knowledge protocols require an NP-problem as building
%  block?

%\item Why is it a good choice in a ZKP to flip a coin when requesting a 
%  proof from the person who knows the secret?

\item \POSTSCRIPT
\end{enumerate}

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