What is the primary purpose of data encryption?

What is the primary purpose of data encryption?

• A. Converting plaintext into ciphertext to protect data confidentiality during storage or transmission.
• B. Compressing data to save space.
• C. Generating a hash to verify integrity.
• D. Storing data in a secure repository.

Answer: (A)

Data encryption is about turning readable information into unreadable form so that only someone with the right key can read it again. The main purpose is to protect data confidentiality during storage or while it’s being transmitted. By converting plaintext into ciphertext, even if an unauthorized person gains access to the data, they can’t understand it without the decryption key. This protection applies whether the data sits on a disk (data at rest) or travels across a network (data in transit). Other ideas don’t fit as the primary purpose: compressing data reduces size but not security; generating a hash checks integrity or authenticity but doesn’t hide the content; storing data in a secure repository helps security in location but doesn’t inherently transform the data to keep it confidential.

Data encryption is about turning readable information into unreadable form so that only someone with the right key can read it again. The main purpose is to protect data confidentiality during storage or while it’s being transmitted. By converting plaintext into ciphertext, even if an unauthorized person gains access to the data, they can’t understand it without the decryption key. This protection applies whether the data sits on a disk (data at rest) or travels across a network (data in transit).

Other ideas don’t fit as the primary purpose: compressing data reduces size but not security; generating a hash checks integrity or authenticity but doesn’t hide the content; storing data in a secure repository helps security in location but doesn’t inherently transform the data to keep it confidential.