Cascaded stream cipher
US6961426B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Sep 4, 2001 |
| Grant date | Nov 1, 2005 |
| Priority date | — |
| Expiry date | Oct 17, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0662
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pseudo-random number generating circuit and method, comprising: a plurality of pseudo-random number generator (PRNG) units combined in a cascade structure of several layers to produce a pseudo-random output stream, the PRNG units of any given layer running more slowly than those PRNG units of more downstream layers of the cascade structure and running more quickly than those PRNG units of more upstream layers of the cascade structure, the PRNG units including a relatively slow but cryptographically very secure PRNG unit feeding the most upstream layer of the cascade structure, and very fast, but possibly cryptographically insecure PRNG unit at the most downstream layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.