Question

What kind of attack makes the Caesar cipher virtually unusable?

A. Meet-in-the-middle attack
B. Escrow attack
C. Frequency analysis attack
D. Transposition attack

Answer 1

Option C). The Caesar cipher is virtually unusable against frequency analysis attacks.

Step-by-step explanation:

The correct answer is C. Frequency analysis attack.

One kind of substitution cipher that moves the alphabetic letters a predetermined number of positions is the Caesar cipher. A shift of three, for instance, would change "A" to "D," "B" to "E," and so forth. In a frequency analysis attack, the predicted letter frequency in the language being used is compared to the letter frequency observed in the encrypted text. This can expose trends and make deciphering the cipher reasonably simple, particularly for longer texts.