| 摘要 |
PURPOSE:To guarantee the security of a software, etc., written in a ROM. CONSTITUTION:A scrambler circuit 10 of a ROM data writer 1 scrambles and ciphers input data, and a ROM data write circuit 11 writes the data scrambled by the scrambler circuit 10 in a ROM 2. The data read from the ROM 2 by a ROM data read circuit 30 of a ROM data reader 3 are descrambled by a clescrambler circuit 31 and made into plane sentences. |
