| 摘要 |
PROBLEM TO BE SOLVED: To provide an encrypting device for generating encrypted data, having lower possibility of being decrypted in unauthorized manner, and to provide a decrypting device for lowering the possibility of decrypting the encrypted data in an unauthorized manner. SOLUTION: The encrypting device 1 is provided with a paper pattern acquiring part 3 for acquiring paper pattern, representing how fibers constituting paper become entangled, and an encrypting part 4 for generating encrypted data by spreading data with acquired paper pattern information as a spread code, and the decrypting device 2 is provided with a paper pattern acquiring part 3 for acquiring paper pattern information, and a decrypting part 7 for despreading the encrypted data, by taking cross-correlation between the acquired paper pattern information and the encrypted data. COPYRIGHT: (C)2008,JPO&INPIT
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