Which statement about encryption is true?

Which statement about encryption is true?

• A. Encryption transforms plaintext into ciphertext using algorithms and keys.
• B. Encryption guarantees absolute privacy in all cases.
• C. Encryption decrypts data automatically.
• D. Encryption uses a password alone to secure data.

Answer: (A)

Encryption turns readable data into unreadable ciphertext by applying cryptographic algorithms and a key. The key guides the transformation, and the correct key (or a related one) is needed to reverse the process and recover the original plaintext. This fundamental idea explains how confidentiality is achieved: without the proper key, the data stays scrambled. It’s important to note that encryption does not guarantee absolute privacy in all situations. Keys can be compromised, implementations can have flaws, and metadata or side-channel information can still reveal details. Decryption isn’t automatic—you must perform the decryption step with the correct key and algorithm. And encryption isn’t based on a password alone; a password can be used to derive a key, but the security relies on the cryptographic key and algorithm, not the password by itself.

Encryption turns readable data into unreadable ciphertext by applying cryptographic algorithms and a key. The key guides the transformation, and the correct key (or a related one) is needed to reverse the process and recover the original plaintext. This fundamental idea explains how confidentiality is achieved: without the proper key, the data stays scrambled.

It’s important to note that encryption does not guarantee absolute privacy in all situations. Keys can be compromised, implementations can have flaws, and metadata or side-channel information can still reveal details. Decryption isn’t automatic—you must perform the decryption step with the correct key and algorithm. And encryption isn’t based on a password alone; a password can be used to derive a key, but the security relies on the cryptographic key and algorithm, not the password by itself.