| 摘要 |
PURPOSE:To obtain the software which can run only with a specific computer by incorporating an LSI which contains an ROM serving as a primary part and functions as a black box. CONSTITUTION:An LSI chip consists of a microprocessor and an ROM (cipher ROM) to which access is possible only through said microprocessor. The microprocessor uses the data given from a computer and the data of the cipher ROM to parameters and produces random numbers repetitively by a congruence equation method, etc. Then the random numbers obtained finally are sent back to the computer. Thus it is impossible for outsiders to know the data of the cipher ROM although they know the regeneration algorithm of random numbers by repeating the generation of random number many times. |
