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Florian Dold 2016-05-11 02:00:58 +02:00
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articles/ui/ui_short.tex
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@ -91,7 +91,7 @@ system (Figure~\ref{fig:system}).
In Taler, customers use a {\em wallet} to withdraw, hold, and spend coins. In Taler, customers use a {\em wallet} to withdraw, hold, and spend coins.
Withdrawing coins requires the customer to authenticate and to optionally Withdrawing coins requires the customer to authenticate and to optionally
authorize the specific transaction, e.g. via a PIN/TAN method as commonly used authorize the specific transaction, e.g. via a PIN/TAN method as commonly used
by banks. Afterwards, the customer can anonymously spend his coins by visiting by banks. Afterwards, the customer can anonymously spend their coins by visiting
merchants without having to authenticate for each transaction. merchants without having to authenticate for each transaction.
The wallet is implemented as a cross-platform browser extension. All The wallet is implemented as a cross-platform browser extension. All
@ -177,7 +177,7 @@ instance of the digital contract with the opportunity to pay for it.
The case where a user already payed for a resource and then visits The case where a user already payed for a resource and then visits
the resource URL (instead of the fulfillment URL) after losing temporary the resource URL (instead of the fulfillment URL) after losing temporary
session state is also handled correctly, since the wallet component will session state is also handled as expected, since the wallet component will
look for contracts that refer to the same resource. look for contracts that refer to the same resource.
While Taler is designed to work well with digital resources on the web, While Taler is designed to work well with digital resources on the web,
@ -197,8 +197,8 @@ are being purchased.
%\end{figure} %\end{figure}
A new payment system must also be easy to deploy for merchants. A new payment system must also be easy to integrate and deploy for merchants.
Figure~\ref{fig:frobearch} shows how the secure payment components of Figure~\ref{fig:frobearch} shows how the security critical payment components of
Taler interact with the logic of existing Web shops. First, the Web shop Taler interact with the logic of existing Web shops. First, the Web shop
front-end is responsible for constructing the shopping cart. For this, front-end is responsible for constructing the shopping cart. For this,
the shop front-end generates the usual Web pages which are shown to the the shop front-end generates the usual Web pages which are shown to the
@ -206,8 +206,8 @@ user's browser client front-end. Once the order has been constructed,
the shop front-end gives a {\em proposed contract} in JSON format to the shop front-end gives a {\em proposed contract} in JSON format to
the payment backend, which signs it and returns it to the front-end. the payment backend, which signs it and returns it to the front-end.
The front-end then transfers the signed contract over the network, and The front-end then transfers the signed contract over the network, and
passes it to the wallet. Here, the wallet operates from a secure {\em passes it to the wallet. Here, the wallet operates from a secure
background} on the client side, which allows the user to securely background context on the client side, which allows the user to securely
accept the payment, and to perform the cryptographic operations in a accept the payment, and to perform the cryptographic operations in a
context that is protected from the Web shop. If the user accepts, the context that is protected from the Web shop. If the user accepts, the
resulting signed coins are transferred from the client to the server, resulting signed coins are transferred from the client to the server,
@ -235,7 +235,7 @@ contract to the backend and {\bf (8)} executing fulfillment business
logic if the backend confirms the validity of the payment. logic if the backend confirms the validity of the payment.
To setup a Taler backend, the merchant only needs to let it know the To setup a Taler backend, the merchant only needs to configure it with the
respective wire transfer routing details, such as an IBAN number. The respective wire transfer routing details, such as an IBAN number. The
customer's authentication of the Web shop continues to rely upon customer's authentication of the Web shop continues to rely upon
\mbox{HTTPS}/X.509. \mbox{HTTPS}/X.509.