Signature-generation method, signature-verification method, public-key distribution method, and information-processing apparatus
US7685429B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2005 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Oct 6, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
To generate and verify signature data using a known signature algorithm whose safety is ensured from the viewpoint of calculation quantity and ensuring the authenticity thereof over a long time period. A message to be signed is transmitted, a padding-data item is added to the message, and a signature-data item of the message with the padding-data item added thereto is generated by using a hash function and a public-key cryptosystem. The addition step and the generation step are performed a predetermined number of times by using the signature-data item, as the padding-data item, and the signature-data items generated the predetermined number of times and the padding-data items added the predetermined number of times are externally transmitted with the message.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.