Certified Information Systems Auditor (CISA) — Question 359

Which of the following is the BEST method to delete sensitive information from storage media that will be reused?

Answer options

• A. Re-partitioning
• B. Crypto-shredding
• C. Reformatting
• D. Multiple overwriting

Correct answer: D

Explanation

The correct answer, Multiple overwriting, is effective because it overwrites the data several times, making recovery extremely difficult. Re-partitioning and reformatting do not securely erase data, as they only modify the directory structures without thoroughly removing the actual data. Crypto-shredding relies on encryption methods that may not be suitable if the encryption keys are not properly destroyed.