Question

A way to improve on the simple monoalphabetic technique is to use different monoalphabetic substitutions as one proceeds through the plaintext message. The general name for this approach is ___________ .

A. rail fence cipher
B. cryptanalysis
C. polyalphabetic substitution cipher
D. polyanalysis cipher

Answer 1

Option C i.e., polyalphabetic substitution cipher.

Step-by-step explanation:

Using that of the various mono-alphabetic replacements as a progresses through all the clear text messages is a method to enhance the basic mono-alphabetic strategy. For such a method the common term is a polyalphabetic substitution cipher.

So, that's why the following option is correct according to the scenario.