KEY MOUNTING SYSTEM AND LSI FOR IMPLEMENTING THE SAME, AS WELL AS KEY MOUNTING METHOD

摘要

PROBLEM TO BE SOLVED: To improve secrecy and concealment for a key in a key mounting system. SOLUTION: A decryption circuit 12 decrypts an encrypted key EKEY1 (EDK1(MK1)) using an encrypted key EDK1(MK1) as a key, and a decryption circuit 13 decrypts an encrypted key EMK1 (KEY1) using the output of the decryption circuit 12, namely an internal key KEY1, as a key. A decryption circuit 14 decrypts the encrypted key EDK1(MK1) using the output of the decryption circuit 13, namely an internal key MK1 as a key, and generates a final key DK1. Namely, all of the keys mounted on a storage unit 1a and an LSI 10 are encrypted. Moreover, the final key DK1 is generated at the LSI 10.