Group signature scheme with improved efficiency, in particular in a join procedure
US8245047B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2005 |
| Grant date | Aug 14, 2012 |
| Priority date | — |
| Expiry date | Apr 10, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3255
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for managing a group signature scheme includes in a setup procedure for group initialization, generating, by a group manager, a group public key. In a join procedure for the group manager to add a new member to the group, the method includes generating by the new member, user information, and providing the generated user information to the group manager, and computing, by the group manager, membership information for the new member based on the user information received by the new member and on the group public key, and providing to the new member the computed membership information. In particular, the membership information is computed, by the group manager, as a function of the inverse of a given hash function of the user information. In a signing procedure for a group member to sign a message on behalf of the group, the method includes: using, by the group member, the membership information and the user information. The method further includes the use of digital certificates, in order for the group member to prove to the group manager the possession of said user information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.