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

Question

Quizplus · Accepted Answer

Polyalphabetic substitution cipher involves using multiple monoalphabetic ciphers to encode one plaintext message. This is done by using different substitution rules for different parts of the message. This makes it more difficult for an attacker to break the cipher since they cannot use frequency analysis to deduce the substitution rule.

A Way to Improve on the Simple Monoalphabetic Technique Is