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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/paper/taler.tex | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/doc/paper/taler.tex b/doc/paper/taler.tex index 9fc5df4f1..9d787bede 100644 --- a/doc/paper/taler.tex +++ b/doc/paper/taler.tex @@ -1422,10 +1422,10 @@ exchange. \begin{theorem} Let $C$ denote a coin controlled by users Alice and Bob. -Suppose Bob creates a coin $C'$ from $C$ using the refresh protocol. +Suppose Bob creates a coin $C'$ from $C$ following the refresh protocol. Assuming the exchange and Bob operated the refresh protocol correctly, -and that they continue to operate the linking protocol - \S\ref{subsec:linking} correctly, +and that the exchange continues to operate the linking protocol +(\S\ref{subsec:linking}) correctly, then Alice can gain control of $C'$ using the linking protocol. \end{theorem} @@ -1442,7 +1442,10 @@ for the residual value on $C'$ and runs the linking protocol to determine if it was refreshed too. \end{proof} -At a result, there is no way for a user to loose control over a coin, +\begin{corollary} + Abusing the refresh protocol to transfer ownership has an + expected loss of $1 - \frac{1}{\kappa}$ of the transaction value. +\end{corollary} \section{Privacy arguments} |