Apolyalphabetic cipher is also known as:

A.
One-time pad.

B.
Steganography.

C.
Vernam cipher.

D.
VigenËre cipher.

Explanation:
The correct answer is VigenËre cipher. * Answer “One-time pad” is incorrect because a one-time pad
uses a random key with length equal to the plaintext message and is used only once. * Answer
“Steganography” is the process of sending a message with no indication that a message even exists.
*Answer “Vernam cipher” is incorrect because it applies to stream ciphers that are XORed with a
random key string.