A COMPUTER IMPLEMENTED METHOD FOR AUTOMATICALLY CERTIFYING DOCUMENTS WITH INTEGRITY AND AUTHENTICITY GUARANTEES AND COMPUTER PROGRAMS THEREOF

摘要

The method comprising: receiving, by a second computer (20), a document (D_o) to be certified, identifying it with metadata and computing a first cryptographic function (h_o); sending, by the second computer (20), the first cryptographic function (h_o) to a third computer (30) hold within a distributed ledger; receiving, by the second computer (20), a message digest (h_ro) corresponding to an identifier of having stored the first cryptographic function (h_o) in the third computer (30); computing, by the second computer (20), a key (K), said computed key (K) being decoded into a watermark, which is applied to the document (D_o) providing a modified document (D_w); sending, by the second computer (20), the modified document (D_w) to the first computer system (10); computing, by the second computer (20), a second cryptographic function (h_w), and sending it and the modified document (D_w) to the third computer (30); the second computer (20) receiving a message digest (h_rw) corresponding to an identifier of having stored the (h_w) and (D_w).