Computer implemented method for automatically certifying documents with integrity and authenticity guarantees and computer programs thereof

Abstract

A computer implemented method for automatically certifying documents with integrity and authenticity guarantees and computer programs thereof. The method comprising: receiving, by a second computer (), a document (D) to be certified, identifying it with metadata and computing a first cryptographic function (h); sending, by the second computer (), the first cryptographic function (h) to a third computer () hold within a distributed ledger; receiving, by the second computer (), a message digest (h) corresponding to an identifier of having stored the first cryptographic function (h) in the third computer (); computing, by the second computer (), a key (K), said computed key (K) being decoded into a watermark, which is applied to the document (D) providing a modified document (D); sending, by the second computer (), the modified document (D) to the first computer system (); computing, by the second computer (), a second cryptographic function (h), and sending it and the modified document (D) to the third computer (); the second computer () receiving a message digest (h) corresponding to an identifier of having stored the (h) and (D).