| 摘要 |
PURPOSE:To attain the different types of ciphering for every device by writing data to a file from a processor after changing the original data sequence based on a fixed quantity of unit information and then ciphering the data stored in the file. CONSTITUTION:The value of a buffer address register is mapped to one of values of the register through a conversion table. The addressing way is uniquely decided at every device with the contents of the conversion table. Thus the sequence of the data to be written to a floppy disk 3 from a buffer memory device 2 depends on the contents of an address conversion table 9. Then these data are written at random at every byte via a data line 7 in accordance with the order proper to each device. In a read mode the data read out of the disk 3 are stored at random within the device 2 by the instruction of the table 9. When all buffers are filled with data, the data are regenerated within the buffers in the original correct order. Thus data can be easily ciphered in an inherent way to each device. |
