Method and device for anonymous signature with a shared private key
US7571324B2 · kind B2 · utility
17Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2002 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | Jul 28, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3255
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cryptographic method and apparatus for anonymously signing a message. Added to the anonymous signature is another signature which is calculated (operation 13) using a private key common to all the members of a group authorized to sign and unknown to all revoked members. The private key is updated (operations 8, 11) at group level on each revocation within the group and at member level only on anonymous signing of a message by the member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.