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add sentence on double-spending detection during refresh

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Christian Grothoff 2017-05-16 15:07:37 +02:00
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doc/paper/taler.tex
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@ -1013,7 +1013,10 @@ than the comparable use of zk-SNARKs in ZeroCash~\cite{zerocash}.
for $i \in \{1,\ldots,\kappa\}$ and sends a signed commitment
$S_{C'}(\vec{B}, \vec{T_p})$ to the exchange.
\item % [200 OK / 409 CONFLICT]
The exchange generates a random $\gamma$ with $1 \le \gamma \le \kappa$ and
The exchange checks that $C'_p$ is a valid coin of sufficient balance
to cover the value of the fresh coins to be generated and prevent
double-spending. Then,
the exchange generates a random $\gamma$ with $1 \le \gamma \le \kappa$ and
marks $C'_p$ as spent by persisting
$\langle C', \gamma, S_{C'}(\vec{B}, \vec{T_p}) \rangle$.
Auditing processes should assure that $\gamma$ is unpredictable until