Method for controlling validity of an attribute
US12170721B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2020 |
| Grant date | Dec 17, 2024 |
| Priority date | — |
| Expiry date | Sep 28, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/50
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A device comprises a hash tree including a root node and a leaf node. An issuing authority having agreed to generate a signature of the root node after having successfully checked validity of an attribute stored in the leaf node. The device identifies a subset of nodes by using a template specifying the structure of the hash tree, said subset comprising, for all paths of the hash tree that do not comprise said leaf node, the node which is the closest to the reference root node and which does not belong to the path comprising said leaf node. A verifier computes a test hash and then computes a test root node by applying a preset rule. The verifier checks that the signature is valid using a data whose authenticity is certified by the issuing authority.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.