Encryption method, cryptographic communication method, ciphertext generating device and cryptographic communication system of public-key cryptosystem
US6990200B1 · kind B1 · utility
10Cited by
10References
18Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 1, 2000 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Jul 31, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4408
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two public keys including a random number term therein are prepared in a database for each divided plaintext in advance, a plaintext is divided into a plurality of 1-bit divided plaintexts, one public key is selected for each divided plaintext from the database according to the bit data of each divided plaintext, and the selected public keys are added to generate a ciphertext. This invention bases its security on free selection of a desired combination of public keys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.