Generating and verifying trusted digital time stamp
US7890765B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2008 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Feb 3, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2151
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods, apparatus and systems for generating a trusted digital time stamp as well as a public time source. It includes, an apparatus for receiving and recording public time information and a method for verifying a digital time stamp. A method for generating a trusted digital time stamp includes: obtaining a first time information and a corresponding random code from a public time source; and generating a digital time stamp using a first time information and random code. A method for verifying a digital time stamp includes: recording time information and corresponding random codes transmitted by a public time source; retrieving time information and a random code contained in the time stamp; and comparing a retrieved random code from the time stamp with one of the recorded random codes that corresponds to a time information in the time stamp, if they are consistent, the time stamp is determined to be trusted, otherwise the time stamp is determined to be not trusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.