Secure paper-free bills in workflow applications

摘要: A system and method allows for paperless billing transaction document exchanges between two parties to a sales transaction, with inherent verification. In an embodiment, the first encrypts data according password which itself depends on unique in particular document. The then employs values create 2-D barcode directly represents data; second encrypted data. matrix codes are overlapped cell-by-cell basis into single visual representation, employing multiple colors different combinations of cells. At receiving end, original can be separated by extracting black white barcodes from combined color code. integrity received is confirmed checking that consistent plaintext barcode. Additional methods employed attach secure, merged biometric image signatures, such as fingerprint images, form