Protection of the integrity of an invoice
29/07/2020
Before, the modification of numerunique invoices was "protected" by a password.
Nowadays, this device is replaced by a hash code:
- number,
- date,
- client name,
- amount HT,
- VAT,
- object(s) of the invoice.
To verify this digital fingerprint, it suffices to recalculate this code from the information on the invoice and to compare the result with the code that appears there. The slightest modification of the elements used to generate the code would lead to the generation of a different hash code.
For a given invoice number (number which is unique), there will therefore be only one valid hash code. This will allow checking if the essential elements of the invoice have been altered or not.
If the hash code that appears on the invoice does not correspond to the one that can be calculated from its essential elements or to that of the original of the invoice, the invoice has been altered.
Otherwise, it is integral.