| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for further safely storing an encryption key. SOLUTION: A data processor is provided with: a first encryptor for generating first encrypted data by encrypting first original data; a first decryption-key generator for generating a first decryption key for decrypting the generated first encrypted data; a second encryptor for generating second encrypted data by encrypting second original data; a second decryption-key generator for generating a second decryption key for decrypting the generated second encrypted data; a first fragmented-data preparator for preparing first fragmented data from a pair of the first encrypted data and the second decryption key; and a second fragmented-data preparator for preparing second fragmented data composed of a pair of the second encrypted data and the first decryption-key data. COPYRIGHT: (C)2007,JPO&INPIT
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