Answer (Choose 2 answers)
Vigenère cipher is used with a key "XO" to encrypt a long English book. You order the letters appearing in the
encrypted book in the decreasing order of frequency (ie., from the most frequently appearing to the least
frequently appearing), and the result is: RGZNFIBJWPESCXHTMYAUOLDKVQ. Which ciphertext letters
correspond to the plaintext letter E (which is the most frequent letter in the plaintext)?
Back
A. E
B. T
C. Y
D. Z
Next
E. G
F. R
R
FU inish the exam.
