問91
頻出度★★★
職場で不要になった PC を廃棄する場合の情報漏えい対策として, 最も適切なものはどれか。
令和6年度 ITパスポート試験 問91
This question's explanation and your answers so far.
解説
問 91
Incorrectア
The OS file deletion function only erases the file's management information (index); the actual data remains on the disk as is. It can be read out with dedicated recovery software, so it is insufficient as a leakage countermeasure.
Incorrectイ
Uninstalling an application only removes the program itself; data files such as documents that were created and saved still remain. The confidential data itself is not erased at all, so it does not serve as a leakage countermeasure.
Incorrectウ
Logical formatting (ordinary formatting) only initializes the management area; the area where the data was actually recorded is not overwritten and remains. The data can be retrieved with recovery tools, so it cannot be called reliable erasure.
- エ
正解 When disposing of a PC, the most reliable way to prevent information leakage is to use dedicated software to overwrite the entire storage device with random data a prescribed number of times, making the original data unrecoverable. File deletion or formatting only erases the management information; the actual data remains on the disk and can be read out with recovery tools. As in option エ, physically overwriting and erasing the contents means that even if a third party attempts data recovery, the original information cannot be retrieved, reliably preventing information leakage.
ここがポイント
- File deletion and logical formatting only erase the management information; the actual data remains on the disk and can be recovered (it appears to be gone but is not actually erased).
- Reliable data erasure (sanitization) requires overwriting with random data a prescribed number of times using dedicated software, or physically destroying the device.