Apparatus and method for proving the denial of a direct proof signature
US7490070B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 2004 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Jun 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/56
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In some embodiments, a method and apparatus for proving the denial of a direct proof signature are described. In one embodiment, a trusted hardware device convinces a verifier that the trusted hardware device possesses cryptographic information without revealing unique, device identification information of the trusted hardware device or the cryptographic information. Once the verifier is convinced that the hardware device possesses the cryptographic information, the verifier may issue a denial of signature request to the trusted hardware device, including at least one compromised direct proof signature. In response, the trusted hardware device issues a denial of the compromised direct proof signature by proving to the verifier that a cryptographic key held by the trusted hardware device was not used to form the at least one compromised direct proof signature. Other embodiments are described and claims.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.