Radio telephone hand set network restriction
US6253073A · kind A · utility
12Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Feb 10, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mobile telephone hand set programmed to operate under the control of a CPU and protected against unauthorized use or cloning by means of a security engine. The security engine comprising a re-programmable write only memory, an interface register and a challenge timer and operating by the issue of a challenge from the challenge timer to the CPU, the CPU on receipt of the challenge responding by writing a value to the interface register for comparison therein with a value stored in the re-programmable write only memory, and the interface register signaling the result of the comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.