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\begin{document}+
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\section*{Homework 2}+
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+
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\begin{enumerate}+
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\item Voice voting is the method of casting a vote in the `open air' for everyone+
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present to hear. Which of the following security requirements do paper ballots +
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satisfy \textbf{better} than voice voting? Check all that apply and give a brief explanation +
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for your decision.+
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+
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\begin{itemize}+
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\item[$\Box$] Integrity+
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\item[$\Box$] Enfranchisement+
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\item[$\Box$] Ballot secrecy+
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\item[$\Box$] Voter authentication+
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\item[$\Box$] Availability+
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\end{itemize}+
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+
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+
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\item Explain how an attacker can use chain voting in order to influence the outcome of a +
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poll using paper ballots. +
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+
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\item Which of the following mechanisms help with defending against chain voting? Check all +
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that apply. Give a brief reason for each defence that mitigates chain voting attacks.+
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+
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\begin{itemize}+
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\item[$\Box$] Using a glass ballot box to make it clear there are no+
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  ballots in the box before the start of the election.+
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\item[$\Box$] Distributing ballots publicly before the election.+
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\item[$\Box$] Checking that a voter's ID (drivers license, passport) matches the voter.+
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\item[$\Box$] Each ballot has a unique ID. When a voter is given a ballot, the ID is recorded. When the voter submits his or her ballot, this ID is checked against the record.+
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\end{itemize}+
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+
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\item In the Estonian general election, votes can be cast via Internet+
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  some time before the election day. These votes cast via Internet can+
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  be changed an unlimited amount of times, the last vote is+
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  tabulated. You can even change your vote on the polling day in+
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  person. Which security requirement does this procedure address?+
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+
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\item What is the main difference between online banking and e-voting? +
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(Hint: Why is the latter so hard to get secure?)+
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+
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\item Imagine, hypothetically, you have a perfectly secure Internet+
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  voting system, by which I mean nobody can tamper with or steal votes+
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  between your browser and the central server responsible for vote+
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  tallying. What can still go wrong with such a perfectly secure+
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  voting system, which is prevented in traditional elections with+
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  paper-based ballots?+
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\end{enumerate}+
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+
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\end{document}+
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