Patent Number: 7,133,524

Title: Key installation system, LSI for implementing the same, and key installation method

Abstract: In the key installation system for improving the confidentiality and concealment of the key, a first decrypting circuit decrypts an encrypted key EKEY1(EDK(MK1)) using an encrypted key EDK1(MK1) as the key. A second decrypting circuit decrypts an encrypted key EMK1(KEY1) using the output of the second decrypting circuit, that is, an internal key KEY1 as the key. A third decrypting circuit decrypts the encrypted key EDK1(MK1) using the output of the second decrypting circuit, that is, an internal key MK1 as the key, to generate a final secret key DK1.

Inventors: Fujiwara; Makoto (Kyoto, JP), Nemoto; Yusuke (Hyogo, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: H04L 9/00 (20060101); G06F 7/58 (20060101); H03B 29/00 (20060101)

Expiration Date: 2019-11-07 0:00:00