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.