| 摘要 |
An encrypted data distributing method includes preparing cipher text which can be decrypted only by a specific trusted device, and performing encryption and decryption processing at a high speed. An encryption key is prepared using an encryption device authentication key unique to an encryption device and a decryption device authentication key unique to a decryption device, and cipher text is prepared by this encryption key. The authentication keys are also sent to the decryption device. In the decryption device, the decryption device authentication key received from the encryption device is compared with the decryption device authentication key prepared by the decryption device to perform decryption processing only when the authentication keys match.
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