| 摘要 |
PURPOSE:To protect software perfectly and surely by enciphering a password, calculating cipher code using random number, obtaining exclusive logical sum of this cipher code and the content of record, and registering in a file. CONSTITUTION:When load instruction is generated from the body 10 of a computer to a floppy disk 11, data decoded by a decoding memory 21 are loaded on the RAM of the computer 10 through a contact (a) of a selector 25. In the case of write instruction, data enciphered by an enciphering memory 22 are sent and written to the floppy disk 11 through a contact (a) of a selector 26. The enciphered code is set by a CPU23 for writing cipher code. When selectors 25, 26 are switched to a contact (b) by a data bus switching mechanism 24, the data are sent and received between the computer 10 and floppy disk 11 without enciphering and decoding. |
