Which of the following is used to hide data in a database so the data can only be read by a user who has a key?

Question

Options

• AData security
• BData masking
• CData protection
• DData encryption

• A
  2% (1)
• B
  3% (2)
• C
  8% (5)
• D
  86% (51)

Explanation

Data encryption (D) is correct because it is the only technique that mathematically transforms data into an unreadable format (ciphertext) that can only be reversed by someone possessing the correct key - exactly what the question describes.

• A (Data security) is too broad; it's an umbrella term covering policies, access controls, and practices - not a specific hiding mechanism.
• B (Data masking) replaces sensitive data with realistic-looking fake data (e.g., showing ***-**-1234 for an SSN), but masked data cannot be "unlocked" with a key - it's altered, not encrypted.
• C (Data protection) is another general concept referring to safeguarding data integrity and availability, not a specific method of concealment.

Memory tip: Think of encryption like a locked safe - only the person with the right key can open it and read what's inside. If the question mentions a key being required to read data, the answer is always encryption.

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