Method and system for automatically checking the authenticity of an identity document

The process comprises a data-acquisition phase with the creation of a database of multicomponent digital signatures constituting fingerprints of identity documents, linked to a central server relocated relative to a primary database comprising variable textual data and images of reference identity documents. A relocated checking phase of identity documents at a checkpoint comprises the digitizing of an identity document to be checked, the creation of a fingerprint of the digitized document, the comparison of the latter with the fingerprint of a document from the fingerprint database indexed with the same reference number and the sending of a message according to the result of the comparison.