Method of digitally signing data and a data repository storing digitally signed data
US8028163B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2006 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | May 8, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/64
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A hierarchical digital signature method is provided by which different levels of data elements of a data entry are processed in turn to derive function values (for example hash function values) for data elements in the level which are to form part of the digital signature. All function values for one level are combined in a further function to provide an additional function value, and the additional function value is used in the processing of data elements in the next level nearer to the root. This provides a digital signature which can use only selected data elements of a data entry, and which is not sensitive to the ordering of the data entry structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.