| 摘要 |
PROBLEM TO BE SOLVED: To apply a data processing circuit to a general-purpose computer by generating the relative address information on every address against the head address and securing the corresponding secret data based on the relative address information. SOLUTION: A CMP 1 has its proper secret key Ksmp. An offset register receives the fetch signal s4 outputted from a CPU 2, fetches the head address data showing the head position of data when the CPU 2 performs the read/write operations to a main memory 21 to stores the head address data and then outputs these data to a scramble code generator 6. Meanwhile, the relative address information on every address is generated against the head address and the corresponding secret data are secured based on the relative address information. The generator 6 generates a scramble code F(Re) from the head address data and the address data inputted from an address bus 16 and outputs the code F(Re) to an adder 11 via a signal path 13. |
