| 摘要 |
An apparatus includes a first storage unit configured to store first data to be backup, an encryption unit configured to generate second data by encrypting the first data by using a cryptographic key, a second storage unit configured to store the second data together with a first identifier of the first data, a third storage unit configured to store the cryptographic key used in the encryption of the first data, in association with the first identifier of the first data, an instruction acceptance unit configured to accept a deletion instruction for the first data stored in the first storage unit, and a deletion unit configured to delete, from the third storage unit in accordance with the deletion instruction, the cryptographic key associated with the first identifier of the first data for which the deletion instruction is accepted. |
