問98
頻出度★★★
社外秘の情報が記録されている媒体などを情報漏えいが起こらないように廃棄する方法として, 適切なものはどれか。
平成29年度 春期 ITパスポート試験 問98
This question's explanation and your answers so far.
解説
問 98
- ア
正解 The correct answer is ア. To safely dispose of media that store confidential company information, the basic principle is to make the recorded content physically unreadable. CDs and DVDs are optical discs, so crushing them (breaking them into small pieces) destroys the recording surface, making the data impossible to recover. Therefore this is an appropriate measure for preventing information leakage. The key idea is that for disposal and erasure, “merely deleting” or “merely sealing” is not enough; you must either physically destroy the medium itself or completely erase it with dedicated software.
Incorrectイ
The data in a PC is stored on storage devices such as the hard disk or SSD, not in the CPU, which performs computation. Even if you destroy the CPU, the data on the disk remains intact, so information leakage cannot be prevented. What should be destroyed is the storage device.
Incorrectウ
Even if you “delete” files or folders on a USB memory stick, in most cases only the management information is removed while the actual data remains, and it can easily be read out with recovery software. Simple deletion is not complete erasure and is insufficient as a measure to prevent information leakage.
Incorrectエ
Even if paper documents are sealed, their contents are not destroyed, and if they are thrown out together with ordinary garbage there is a risk that a third party could take them away and read them. Confidential paper documents must be disposed of after being made unreadable, for example by shredding them.
ここがポイント
- When disposing of confidential media, mere deletion or sealing is insufficient; the principle is to make the recorded content physically or logically unrecoverable (crushing, complete erasure, or shredding).
- A PC's confidential data is stored on storage devices such as the hard disk, not on the CPU, so the target of erasure or destruction is the storage device.
用語