Document authentication using extracted digital fingerprints

A document forgery detection system comprising:

• a forgery database operatively coupled to a computer server, the forgery database comprising multiple digital fingerprint records based on forged or altered documents of a given document type;
• and
• stored instructions executable in the computer server to cause the server to—
• access a digital image of a suspect document of the given type;
• select an authentication region of the digital image based on the document type;
• extract a feature from the selected authentication region;
• query the database to find digital fingerprint records that match the authentication region and extracted feature data pair;
• count a number of the matching records;
• compare the count to a predetermined threshold to determine a confidence level that the suspect document is forged;
• and
• based on the comparison, generate a report of the confidence level for the suspect document.