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Diffstat (limited to 'doc/paper/taler.tex')
| -rw-r--r-- | doc/paper/taler.tex | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/doc/paper/taler.tex b/doc/paper/taler.tex index ba1536f2e..80d83107f 100644 --- a/doc/paper/taler.tex +++ b/doc/paper/taler.tex @@ -838,10 +838,9 @@ interaction with the exchange: the exchange to request withdrawal of $C$; here, $B_b$ denotes Chaum-style blinding with blinding factor $b$. \item - The exchange checks if the same withdrawal request was issued before; - in this case, it sends a Chaum-style blind signature $S_K(B)$ with - private key $K_s$ to the customer. \\ - If this is a fresh withdrawal request, the exchange performs the following transaction: + The exchange checks its database if there is an existing withdraw record $\langle S_W(B), x \rangle$ + with existing withdraw response $x$; in this case it sends back $x$.\\ + Otherwise if this is a fresh withdrawal request, the exchange performs the following transaction: \begin{enumerate} \item checks if the reserve $W_p$ has sufficient funds for a coin of value corresponding to $K$, @@ -850,7 +849,7 @@ interaction with the exchange: for future reference, \item deducts the amount corresponding to $K$ from the reserve, \end{enumerate} - and then sends $S_K(B)$ to the customer. + and then sends Chaum-style blind signature $S_K(B)$ to the customer. If the guards for the transaction fail, the exchange sends a descriptive error back to the customer, with proof that it operated correctly. Assuming the signature was valid, this would involve showing the transaction |