| 摘要 |
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. |
