Which of the following is not a type of poly alphabetic cipher?
A. Auto key cipher
B. Hill cipher
C. Playfair cipher
D. Additive cipher
Answer:D
Which of the following is not a type of poly alphabetic cipher?
A. Auto key cipher B. Hill cipher C. Playfair cipher D. Additive cipher
Explanation: In polyalphabetic cipher, each symbol of plain text is replaced by a different ciphertext regardless of its occurrence. Out of the given options, the only additive cipher is not a polyalphabetic cipher.