Method for incremental authentication of documents
US7315866B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2004 |
| Grant date | Jan 1, 2008 |
| Priority date | — |
| Expiry date | Dec 22, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99943
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of protecting an electronic document, the method comprising dividing an original document into data blocks; generating a corresponding hash value for each data block; generating a corresponding hash value for a group of data blocks (GOB); generating a hash tree structure based on the corresponding hash values for the data blocks and for the GOB; calculating a hash value of a root node of the hash tree structure, the root node having no parent in the hash tree structure; signing the hash value of the root node; and generating auxiliary authentication data; wherein said auxiliary authentication data enables authentication of portions of the electronic document based on a reconstruction of the hash tree structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.