\documentclass{article}+
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\usepackage{charter}+
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\usepackage{hyperref}+
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\usepackage{amssymb}+
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\begin{document}+
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\section*{Homework 6}+
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\begin{enumerate}+
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\item Zero-knowledge protocols depend on three main properties called+
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  completeness, soundness and zero-knowledge.  Explain what they mean?+
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\item Why do zero-knowledge protocols require an NP-problem as building+
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  block?+
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\item Why is it a good choice in a ZKP to flip a coin when requesting a +
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  proof from the person who knows the secret?+
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\end{enumerate}+
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\end{document}+
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%%% End: +
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