Kizspy | Question: 18 (Choose 1 answer)
Vigenère cipher is used with a key "XO" to encrypt a long English book, comprised of English alphabet letters and ignoring capitalization and other symbols. The key length is fixed, i.e., the key is 2 alphabets long. What is the number of possible distinct keys?
A. 26
B. 52
C. 676
D. 1352
