Public electronic document dating list

摘要

Systems and methods are disclosed which enable the establishment of file dates and the absence of tampering, even for documents held in secrecy and those stored in uncontrolled environments, but which does not require trusting a timestamping authority or document archival service. A trusted timestamping authority (TTSA) may be used, but even if the TTSA loses credibility or a challenger refuses to acknowledge the validity of a timestamp, a date for an electronic document may still be established. Systems and methods are disclosed which enable detection of file duplication in large collections of documents, which can improve searching for documents within the large collection.

主权项

1. A computer implemented method of establishing date evidence for a document, the method executable by a processor, the method comprising:
receiving an electronic copy of the document onto a non-transitory computer readable medium; generating a first integrity verification code (IVC) for the document; receiving a first closed document dating list (DDL) edition; searching, within the first DDL edition, for an IVC matching the first IVC; responsive to identifying the matching IVC within the first DDL edition, generating a report to indicate that the first IVC matches an IVC within the first DDL edition; generating a second IVC for the first DDL edition; receiving a date-asserted IVC; comparing the second IVC with the date-asserted IVC; responsive to determining that the second IVC matches the date-asserted IVC, generating a report to indicate that the second IVC matches the date-asserted IVC.