diff options
| author | Florian Dold <florian.dold@gmail.com> | 2017-05-17 16:53:36 +0200 |
|---|---|---|
| committer | Florian Dold <florian.dold@gmail.com> | 2017-05-17 16:53:36 +0200 |
| commit | e53a736dcaccea4de2f5adcd5c332f0016c7d3a5 (patch) | |
| tree | 466ea9f37411ecb941ff7b57c65986fecdaf56fa /doc | |
| parent | 191bcd67f896272da313b958b97d37a6da27995a (diff) | |
clarify withdraw existing response lookup
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/paper/taler.tex | 9 | ||||
| -rw-r--r-- | doc/paper/taler_FC2017.txt | 3 |
2 files changed, 7 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 diff --git a/doc/paper/taler_FC2017.txt b/doc/paper/taler_FC2017.txt index daf13138a..06fe468d4 100644 --- a/doc/paper/taler_FC2017.txt +++ b/doc/paper/taler_FC2017.txt @@ -150,6 +150,9 @@ Specific comments: point: 2nd line also reads as “if the same withdrawal request was issued before the exchange will send S_K(B)” +> We added some clarification that the exchange looks up if the request +> already exists in their database. + - Section 4.2, it seems that a customer can use a coin of value say $10 to multiple transactions of <= $10 in total. I.e. it can first a pay a merchant M1 $2 and then a merchant M2 another $5 dollars. In that case the exchange can |