Method of producing a decrypting apparatus having a cryptographic device and cryptographic information, a system for providing such device and information, and the decrypting apparatus produced by the production method

摘要

The main disclosure of the present invention is a method of producing a decrypting apparatus that includes a cryptographic device and a decryption key. Using the production method, the decryption key is confidentially acquired under a security-controlled condition, and conversion information is generated, the conversion information including encrypted decryption key which has been obtained by encrypting the acquired decryption key using an encryption method. Then, the conversion information is written in a nonvolatile memory which is to be incorporated in the decryption apparatus, and the decryption apparatus is assembled to include the cryptographic device in which a first circuit and a second circuit have been integrated, the first circuit decrypting the conversion information, and the second circuit performing decryption using the decryption key.