An attacker analyzes how small changes in plaintext input affect ciphertext output to deduce encryption...

The CEH Cryptanalysis module describes differential cryptanalysis as an attack that studies the relationship between differences in input and resulting differences in output to recover secret keys.

Option A precisely matches this definition.

Option B relies on execution timing.

Option C requires ciphertext manipulation.

Option D exhaustively tests keys.

CEH lists differential cryptanalysis as a foundational theoretical attack.