Hybrid signature scheme
US7877610B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 21, 2007 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Jan 28, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3252
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A signature scheme is provided in which a message is divided into a first portion which is hidden and is recovered during verification, and a second portion which is visible and is required as input to the verification algorithm. A first signature component is generated by encrypting the first portion alone. An intermediate component is formed by combining the first component and the visible portion and cryptographically hashing them. A second signature component is then formed using the intermediate component and the signature comprises the first and second components with the visible portion. A verification of the signature combines a first component derived only from the hidden portion of the message with the visible portion and produces a hash of the combination. The computed hash is used together with publicly available information to generate a bit string corresponding to the hidden portion. If the required redundancy is present the signature is accepted and the message reconstructed from the recovered bit string and the visible portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.