I am having a very difficult time trying to understand what exactly this question is asking.
How many valid English plaintexts are there for the ciphertext message CJU using a length-3, one-time pad of cyclic shifts, (i, j, k)?
If the encrypted question message is CJU and the one time pad is i, j, k would there not be exactly 1 solution? We are given the one time pad i, j, k so we can derive the plaintext simply by some alagebra
(x + 9) % 26 = 3
(y + 10) % 26 = 10
(z + 11) % 26 = 21
Where x, y, and z are the plaintext letters T, Z, J?
I feel like this is a trick question that I am not understanding