CompTIA SecurityX (CAS-005) — Question 273

Which of the following enables the meaningful manipulation of encrypted data when the processor does not know the encryption key?

Answer options

• A. Simultaneous authentication of equals
• B. Envelope encryption
• C. Authenticated encryption with associated data
• D. Homomorphic encryption

Correct answer: D

Explanation

Homomorphic encryption is the correct answer as it allows computations on ciphertexts, generating encrypted results that, when decrypted, match the result of operations performed on the plaintext. The other options, such as simultaneous authentication of equals, envelope encryption, and authenticated encryption with associated data, do not facilitate manipulation of encrypted data without access to the key.