| 摘要 |
Encrypted data is prevented from being decrypted to avoid data leakage. The encrypted data obtained by encrypting data to be processed corresponds to an enumeration of header data (501) and multiple pieces of divisional encrypted data (502). A decryption processing apparatus decrypts the encrypted data obtained in an encrypting processing apparatus. For the decryption, the decryption processing apparatus uses a solution used for encrypting the data to obtain the encrypted data in the encryption processing apparatus and a file name of the encrypted data. In the present invention, an area in the header data (501) corresponding to a file name, in which the file name of the encrypted data is recorded, is deleted or overwritten at appropriate timing to be destroyed, thereby preventing the encrypted data from being decrypted.
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