| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe transfer method for data for a programmable circuit, which is provided with a control unit, a read only memory(ROM) having data to be transferred, a writable memory and a data bus for connecting the ROM and the writable memory, for controlling the data bus with the control unit. SOLUTION: The secret data element of N bits to be transferred is transited through the data bus for the unit of byte and each of bytes is transited through the data bus just once. Further, the byte is transferred according to a transfer rule having at least one parameter selected at random by the control unit before transferring each of secret data elements. |
