Authentication system for digital cellular communications
US5091942A · kind A · utility
224Cited by
14References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1990 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Jul 23, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system for the authentication of mobile stations and base stations in a cellular communications network. The system includes an algorithm which generates not only a key dependent response to a random challenge, but also a temporary conversation key or call variable which may be used to encipher traffic in the network. To protect against clones in the network, the algorithm uses a rolling key which contains historical information. A bilateral authentication procedure may be used to update the rolling key and to generate a new conversation key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.