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\title{E-Cash Comparison}
\date{\today}

\begin{document}

\maketitle

\section{Criteria}

\begin{itemize}
  \item \textbf{Cryptographic Assumptions.}  This needs to be included 
    and needs to contain more than just ROM because some schemes advertise that
    they don't need ROM but rely on some other rather strong assumptions.
  \item \textbf{Refunds.}
  \item \textbf{Offline Spending.}  Causes brittleness, not a goal.
  \item \textbf{Exculpability When Restoring From Backup}.  Usually conflicts with offline double spending detection.
  \item \textbf{Traceability.} Means that (a threshold of) authorities can deanonymize a customer
    if required (e.g. to catch a criminal).
  \item \textbf{Transferability.}.  Ability to transfer a coin from one user to another.
  \item \textbf{Taxability / Income Transparency.}  E-Cash can't be reliably transferred
    without the transaction being recorded at the exchange.
  \item \textbf{Time/Storage for Deposit.}  Often not considered, especially
    in ``constant time'' schemes.
  \item \textbf{Time/Storage for Withdrawal.}
  \item \textbf{Divisibility/Change.}.
  \item \textbf{Robust Spending.}  The customer either can prove that they payed for
    a contract, or they can get their (unlinkable) money back.
  \item \textbf{Provably Secure.}
  \item \textbf{Endorsed (??).}  Separation of the coin and permission to spend
    it, see \cite{camenisch2007endorsed}.  Allows fair exchange (?).
\end{itemize}

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