Distributed digital signature generation method and digitally signed digital document generation method and apparatus
US7174460B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2002 |
| Grant date | Feb 6, 2007 |
| Priority date | — |
| Expiry date | Jun 20, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3255
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a distributed digital signature generation method, the method includes the steps of: generating partial signature keys by distributed processes, generating partial digital signatures by using the partial signature keys for the hash value of an input digital document to which additional information such as time is added, combining a predetermined threshold number of partial digital signatures, performing a transformation process on the partial digital signatures according to the combination, and generating an integrated digital signature from the result of the transformation process, in which a least common multiple of predetermined values is used as a transformation number, and it is judged whether an incorrect partial digital signature exists and the number is one, and the incorrect partial digital signature is identified when the number is one.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.