Document verification with distributed calendar infrastructure
US9876779B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2015 |
| Grant date | Jan 23, 2018 |
| Priority date | — |
| Expiry date | Sep 1, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/50
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A client system is configured to obtain signatures for digital input records. An application program interface reformats each digital record, and this is used as an argument to a cryptographic hash function, from which a signature request is formed. The signature request is then submitted to a keyless, distributed hash tree infrastructure system, which returns a signature that includes recomputation values enabling recomputation from the result of the cryptographic hash function upward through the hash tree infrastructure to a root hash value at a calendar period corresponding to a time during which the signature request was originally submitted. An arbitrary subsequent test digital record is considered authenticated if, applying the cryptographic hash function to it, along with any other parameters included in the original computation, and recomputing an uppermost value using the recomputation values, the same composite calendar value is attained as when it was originally computed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.