According to Greek law, since 2003 several documents relevant to the Greek taxation system, such as an Invoices or retail Receipts, have to be electronically signed by a specific method (hardware + software system). The signature can later be used to verify document authenticity.
The signature is printed at the end of the document, along with a QR code, representing a verification URL.
TaxSpooler is the software needed to operate several document electronic signature machines in the Greek market, like all MAT Electronics machines, Casio ones, etc.
The system, in a simplified description, applies the SHA-1 algorithm to text contents of document submitted and constructs an electronic signature that is then printed along with a QR code and with the document itself submitted, so that the document can later be verified against this signature.
There are two ways of operation, according to Greek law:
Use of type B operational way gives the most efficient and powerful results.
TaxSpooler server can be installed on all Windows 32/64bit starting with Windows 7 and newer, or corresponding servers.
Clients requesting a document to be signed can be nearly of
any Operating System, provided they can communicate with Windows
The recommended communication method is TCP/IP.
Among the tested Operating Systems, for client software, are: Digital Unix-64, IBM AS-400, IBM AIX, HP-UX, Linux (several variations), SCO Unix, SCO UnixWare.
Software is available to download and fully operable with virtual signing machine (EAFDSS).
You can fully test the software, with these virtual signing machines, without presence of the physical signing machine.
However, please keep in mind software interface is in the Greek Language, and you will also need Greek regional settings on the Windows site.