| 摘要 |
In computer system comprising a computer (10) and a peripheral (such as a radio transceiver card 18), the computer is operable to run a device driver (28a) for the peripheral and an application (30a), and the computer is operable to produce a command (CON) in dependence upon the application and device driver and to make the command available to the peripheral to control the peripheral. In order to enable the peripheral to have low intelligence, not requiring its own microprocessor, but prevent inappropriate commands being actioned by the peripheral, the. peripheral is operable in response to receipt of such a command to compute a challenge (CHN) and to make the challenge available to the computer. The computer is then operable in dependence upon the device driver to compute a response (RN) which is a first predetermined function, at least in part, of the challenge and to make the response available to the peripheral. The peripheral is operable to test the response and to execute or not execute the command in dependence upon the result of the test.
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