| 摘要 |
The method involves passing data from the keyboard (1) directly via the cable (2) to a specific closed circuit (3). The circuit consists of an interface unit (4), loadable memory (5), static memory (6), encoding unit (7), certification unit (7.1), temporary information memory (8) and temporary signature memory (9). The closed circuit is directly connected with the keyboard via the cable, hence no software simulated data are input into the closed circuit. The input data is held in a temporary data memory (8) and a signature is formed with the help of the contents of the static memory, encoding unit and certification unit. The source, completeness and correctness of the information is then proved. The information (12) and signature (13) are readable or coded according to use and sent via interface to the bus system to be processed by computer. |
