| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To specify manufacturers who have manufactured terminal devices, system LSI or storage devices, which have been illegally provided, from devices themselves. <P>SOLUTION: A confidential information implementation system is provided with LSI, which has a memory part, and stores first encrypted confidential information that final confidential information is encrypted by using internal confidential information and second encrypted confidential information that internal confidential information is encrypted using converted confidential information, and a seed generation part, which stores a first constant that includes address information and is a generator of conversion seeds, and second and third constants that are generators of test conversion seeds and outputs the first, second and third constants as conversion or test conversion seeds, corresponding to a test signal and a mode configuration value; furthermore has a unidirectional function circuit, which converts the conversion or test conversion seeds by using the first encrypted confidential information and generates converted or test-converted confidential information, a decryption circuit which decrypts the second encrypted confidential information by using a key that is the output from the unidirectional function circuit, and a decryption circuit which decrypts the first encrypted confidential information by using a key that is the output from the decryption circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
